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Finding the Fourth Proportional to 390,942.61, 539,222.62 and 358,781.11

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Solution

The fourth proportional to 390,942.61, 539,222.62 and 358,781.11 is: 494,862.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,942.61 : 539,222.62 = 358,781.11 : x
  2. Step 2: Convert to fraction form
    390,942.61/539,222.62 = 358,781.11/x
  3. Step 3: Cross multiply
    390,942.61x = 539,222.62 × 358,781.11
  4. Step 4: Simplify right side
    390,942.61x = 193,462,890,140.71
  5. Step 5: Solve for x
    x = 193,462,890,140.71/390,942.61
  6. Step 6: Final answer
    x = 494,862.64

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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.