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Finding the Fourth Proportional to 390,132.60, 585,215.10 and 123,885.60

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Solution

The fourth proportional to 390,132.60, 585,215.10 and 123,885.60 is: 185,833.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,132.60 : 585,215.10 = 123,885.60 : x
  2. Step 2: Convert to fraction form
    390,132.60/585,215.10 = 123,885.60/x
  3. Step 3: Cross multiply
    390,132.60x = 585,215.10 × 123,885.60
  4. Step 4: Simplify right side
    390,132.60x = 72,499,723,792.56
  5. Step 5: Solve for x
    x = 72,499,723,792.56/390,132.60
  6. Step 6: Final answer
    x = 185,833.54

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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.