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Finding the Fourth Proportional to 390,942.65, 539,222.69 and 358,781.15

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Solution

The fourth proportional to 390,942.65, 539,222.69 and 358,781.15 is: 494,862.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,942.65 : 539,222.69 = 358,781.15 : x
  2. Step 2: Convert to fraction form
    390,942.65/539,222.69 = 358,781.15/x
  3. Step 3: Cross multiply
    390,942.65x = 539,222.69 × 358,781.15
  4. Step 4: Simplify right side
    390,942.65x = 193,462,936,824.29
  5. Step 5: Solve for x
    x = 193,462,936,824.29/390,942.65
  6. Step 6: Final answer
    x = 494,862.70

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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.