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Finding the Fourth Proportional to 257,591.91, 386,499.11 and 139,346.49

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Solution

The fourth proportional to 257,591.91, 386,499.11 and 139,346.49 is: 209,079.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,591.91 : 386,499.11 = 139,346.49 : x
  2. Step 2: Convert to fraction form
    257,591.91/386,499.11 = 139,346.49/x
  3. Step 3: Cross multiply
    257,591.91x = 386,499.11 × 139,346.49
  4. Step 4: Simplify right side
    257,591.91x = 53,857,293,669.89
  5. Step 5: Solve for x
    x = 53,857,293,669.89/257,591.91
  6. Step 6: Final answer
    x = 209,079.91

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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.