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Finding the Fourth Proportional to 138,773.52, 191,317.01 and 87,760.80

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Solution

The fourth proportional to 138,773.52, 191,317.01 and 87,760.80 is: 120,989.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,773.52 : 191,317.01 = 87,760.80 : x
  2. Step 2: Convert to fraction form
    138,773.52/191,317.01 = 87,760.80/x
  3. Step 3: Cross multiply
    138,773.52x = 191,317.01 × 87,760.80
  4. Step 4: Simplify right side
    138,773.52x = 16,790,133,412.40
  5. Step 5: Solve for x
    x = 16,790,133,412.40/138,773.52
  6. Step 6: Final answer
    x = 120,989.46

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1.5x scale

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.