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Finding the Fourth Proportional to 390,172.08, 585,279.72 and 123,913.20

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Solution

The fourth proportional to 390,172.08, 585,279.72 and 123,913.20 is: 185,876.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,172.08 : 585,279.72 = 123,913.20 : x
  2. Step 2: Convert to fraction form
    390,172.08/585,279.72 = 123,913.20/x
  3. Step 3: Cross multiply
    390,172.08x = 585,279.72 × 123,913.20
  4. Step 4: Simplify right side
    390,172.08x = 72,523,883,000.30
  5. Step 5: Solve for x
    x = 72,523,883,000.30/390,172.08
  6. Step 6: Final answer
    x = 185,876.66

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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.