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Finding the Fourth Proportional to 139,890.32, 209,757.68 and 56,687.12

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Solution

The fourth proportional to 139,890.32, 209,757.68 and 56,687.12 is: 84,999.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,890.32 : 209,757.68 = 56,687.12 : x
  2. Step 2: Convert to fraction form
    139,890.32/209,757.68 = 56,687.12/x
  3. Step 3: Cross multiply
    139,890.32x = 209,757.68 × 56,687.12
  4. Step 4: Simplify right side
    139,890.32x = 11,890,558,777.08
  5. Step 5: Solve for x
    x = 11,890,558,777.08/139,890.32
  6. Step 6: Final answer
    x = 84,999.15

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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.