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Finding the Fourth Proportional to 138,472.70, 191,092.50 and 74,810.50

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Solution

The fourth proportional to 138,472.70, 191,092.50 and 74,810.50 is: 103,238.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,472.70 : 191,092.50 = 74,810.50 : x
  2. Step 2: Convert to fraction form
    138,472.70/191,092.50 = 74,810.50/x
  3. Step 3: Cross multiply
    138,472.70x = 191,092.50 × 74,810.50
  4. Step 4: Simplify right side
    138,472.70x = 14,295,725,471.25
  5. Step 5: Solve for x
    x = 14,295,725,471.25/138,472.70
  6. Step 6: Final answer
    x = 103,238.58

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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.