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Finding the Fourth Proportional to 138,810.65, 191,559.13 and 75,148.70

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Solution

The fourth proportional to 138,810.65, 191,559.13 and 75,148.70 is: 103,705.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,810.65 : 191,559.13 = 75,148.70 : x
  2. Step 2: Convert to fraction form
    138,810.65/191,559.13 = 75,148.70/x
  3. Step 3: Cross multiply
    138,810.65x = 191,559.13 × 75,148.70
  4. Step 4: Simplify right side
    138,810.65x = 14,395,418,446.96
  5. Step 5: Solve for x
    x = 14,395,418,446.96/138,810.65
  6. Step 6: Final answer
    x = 103,705.44

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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.