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Finding the Fourth Proportional to 696,445.65, 961,135.02 and 390,620.13

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Solution

The fourth proportional to 696,445.65, 961,135.02 and 390,620.13 is: 539,078.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    696,445.65 : 961,135.02 = 390,620.13 : x
  2. Step 2: Convert to fraction form
    696,445.65/961,135.02 = 390,620.13/x
  3. Step 3: Cross multiply
    696,445.65x = 961,135.02 × 390,620.13
  4. Step 4: Simplify right side
    696,445.65x = 375,438,686,459.95
  5. Step 5: Solve for x
    x = 375,438,686,459.95/696,445.65
  6. Step 6: Final answer
    x = 539,078.23

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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.