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Finding the Fourth Proportional to 661,545.32, 991,065.86 and 390,863.96

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Solution

The fourth proportional to 661,545.32, 991,065.86 and 390,863.96 is: 585,556.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,545.32 : 991,065.86 = 390,863.96 : x
  2. Step 2: Convert to fraction form
    661,545.32/991,065.86 = 390,863.96/x
  3. Step 3: Cross multiply
    661,545.32x = 991,065.86 × 390,863.96
  4. Step 4: Simplify right side
    661,545.32x = 387,371,926,660.41
  5. Step 5: Solve for x
    x = 387,371,926,660.41/661,545.32
  6. Step 6: Final answer
    x = 585,556.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.