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Finding the Fourth Proportional to 696,438.39, 961,125 and 390,612.87

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Solution

The fourth proportional to 696,438.39, 961,125 and 390,612.87 is: 539,068.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    696,438.39 : 961,125 = 390,612.87 : x
  2. Step 2: Convert to fraction form
    696,438.39/961,125 = 390,612.87/x
  3. Step 3: Cross multiply
    696,438.39x = 961,125 × 390,612.87
  4. Step 4: Simplify right side
    696,438.39x = 375,427,794,678.75
  5. Step 5: Solve for x
    x = 375,427,794,678.75/696,438.39
  6. Step 6: Final answer
    x = 539,068.21

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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.