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Finding the Fourth Proportional to 979.78, 1,476.31 and 810.22

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Solution

The fourth proportional to 979.78, 1,476.31 and 810.22 is: 1,220.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.78 : 1,476.31 = 810.22 : x
  2. Step 2: Convert to fraction form
    979.78/1,476.31 = 810.22/x
  3. Step 3: Cross multiply
    979.78x = 1,476.31 × 810.22
  4. Step 4: Simplify right side
    979.78x = 1,196,135.89
  5. Step 5: Solve for x
    x = 1,196,135.89/979.78
  6. Step 6: Final answer
    x = 1,220.82

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1.5x scale

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.