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Finding the Fourth Proportional to 137,568.69, 189,764.13 and 86,500.47

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Solution

The fourth proportional to 137,568.69, 189,764.13 and 86,500.47 is: 119,319.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,568.69 : 189,764.13 = 86,500.47 : x
  2. Step 2: Convert to fraction form
    137,568.69/189,764.13 = 86,500.47/x
  3. Step 3: Cross multiply
    137,568.69x = 189,764.13 × 86,500.47
  4. Step 4: Simplify right side
    137,568.69x = 16,414,686,434.14
  5. Step 5: Solve for x
    x = 16,414,686,434.14/137,568.69
  6. Step 6: Final answer
    x = 119,319.93

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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.