Home / 138,631.64-191,331.38-78,207.87

Finding the Fourth Proportional to 138,631.64, 191,331.38 and 78,207.87

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Solution

The fourth proportional to 138,631.64, 191,331.38 and 78,207.87 is: 107,937.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,631.64 : 191,331.38 = 78,207.87 : x
  2. Step 2: Convert to fraction form
    138,631.64/191,331.38 = 78,207.87/x
  3. Step 3: Cross multiply
    138,631.64x = 191,331.38 × 78,207.87
  4. Step 4: Simplify right side
    138,631.64x = 14,963,619,693.96
  5. Step 5: Solve for x
    x = 14,963,619,693.96/138,631.64
  6. Step 6: Final answer
    x = 107,937.98

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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.