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Finding the Fourth Proportional to 390,235.90, 585,229.28 and 123,934.13

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Solution

The fourth proportional to 390,235.90, 585,229.28 and 123,934.13 is: 185,861.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,235.90 : 585,229.28 = 123,934.13 : x
  2. Step 2: Convert to fraction form
    390,235.90/585,229.28 = 123,934.13/x
  3. Step 3: Cross multiply
    390,235.90x = 585,229.28 × 123,934.13
  4. Step 4: Simplify right side
    390,235.90x = 72,529,879,018.73
  5. Step 5: Solve for x
    x = 72,529,879,018.73/390,235.90
  6. Step 6: Final answer
    x = 185,861.63

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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.