Home / 1,121,858,982.78-1,690,445,981.72-921,867,105.66

Finding the Fourth Proportional to 1,121,858,982.78, 1,690,445,981.72 and 921,867,105.66

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Solution

The fourth proportional to 1,121,858,982.78, 1,690,445,981.72 and 921,867,105.66 is: 1,389,093,075.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121,858,982.78 : 1,690,445,981.72 = 921,867,105.66 : x
  2. Step 2: Convert to fraction form
    1,121,858,982.78/1,690,445,981.72 = 921,867,105.66/x
  3. Step 3: Cross multiply
    1,121,858,982.78x = 1,690,445,981.72 × 921,867,105.66
  4. Step 4: Simplify right side
    1,121,858,982.78x = 1,558,366,544,438,184,192
  5. Step 5: Solve for x
    x = 1,558,366,544,438,184,192/1,121,858,982.78
  6. Step 6: Final answer
    x = 1,389,093,075.30

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.