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Finding the Fourth Proportional to 1,218,249.90, 1,680,621.75 and 788,669.10

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Solution

The fourth proportional to 1,218,249.90, 1,680,621.75 and 788,669.10 is: 1,087,998.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218,249.90 : 1,680,621.75 = 788,669.10 : x
  2. Step 2: Convert to fraction form
    1,218,249.90/1,680,621.75 = 788,669.10/x
  3. Step 3: Cross multiply
    1,218,249.90x = 1,680,621.75 × 788,669.10
  4. Step 4: Simplify right side
    1,218,249.90x = 1,325,454,443,012.93
  5. Step 5: Solve for x
    x = 1,325,454,443,012.93/1,218,249.90
  6. Step 6: Final answer
    x = 1,087,998.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.