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Finding the Fourth Proportional to 138,589.60, 191,253.80 and 74,927.40

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Solution

The fourth proportional to 138,589.60, 191,253.80 and 74,927.40 is: 103,399.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,589.60 : 191,253.80 = 74,927.40 : x
  2. Step 2: Convert to fraction form
    138,589.60/191,253.80 = 74,927.40/x
  3. Step 3: Cross multiply
    138,589.60x = 191,253.80 × 74,927.40
  4. Step 4: Simplify right side
    138,589.60x = 14,330,149,974.12
  5. Step 5: Solve for x
    x = 14,330,149,974.12/138,589.60
  6. Step 6: Final answer
    x = 103,399.89

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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.