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Finding the Fourth Proportional to 137,568.70, 189,764.16 and 86,500.50

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Solution

The fourth proportional to 137,568.70, 189,764.16 and 86,500.50 is: 119,319.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,568.70 : 189,764.16 = 86,500.50 : x
  2. Step 2: Convert to fraction form
    137,568.70/189,764.16 = 86,500.50/x
  3. Step 3: Cross multiply
    137,568.70x = 189,764.16 × 86,500.50
  4. Step 4: Simplify right side
    137,568.70x = 16,414,694,722.08
  5. Step 5: Solve for x
    x = 16,414,694,722.08/137,568.70
  6. Step 6: Final answer
    x = 119,319.98

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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.