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Finding the Fourth Proportional to 257,763.66, 386,755.65 and 139,518.78

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Solution

The fourth proportional to 257,763.66, 386,755.65 and 139,518.78 is: 209,337.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,763.66 : 386,755.65 = 139,518.78 : x
  2. Step 2: Convert to fraction form
    257,763.66/386,755.65 = 139,518.78/x
  3. Step 3: Cross multiply
    257,763.66x = 386,755.65 × 139,518.78
  4. Step 4: Simplify right side
    257,763.66x = 53,959,676,446.11
  5. Step 5: Solve for x
    x = 53,959,676,446.11/257,763.66
  6. Step 6: Final answer
    x = 209,337.80

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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.