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Finding the Fourth Proportional to 678,129.59, 935,830.70 and 372,234.57

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Solution

The fourth proportional to 678,129.59, 935,830.70 and 372,234.57 is: 513,690.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,129.59 : 935,830.70 = 372,234.57 : x
  2. Step 2: Convert to fraction form
    678,129.59/935,830.70 = 372,234.57/x
  3. Step 3: Cross multiply
    678,129.59x = 935,830.70 × 372,234.57
  4. Step 4: Simplify right side
    678,129.59x = 348,348,536,346.13
  5. Step 5: Solve for x
    x = 348,348,536,346.13/678,129.59
  6. Step 6: Final answer
    x = 513,690.22

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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.