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Finding the Fourth Proportional to 138,572.78, 191,230.71 and 74,910.57

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Solution

The fourth proportional to 138,572.78, 191,230.71 and 74,910.57 is: 103,376.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,572.78 : 191,230.71 = 74,910.57 : x
  2. Step 2: Convert to fraction form
    138,572.78/191,230.71 = 74,910.57/x
  3. Step 3: Cross multiply
    138,572.78x = 191,230.71 × 74,910.57
  4. Step 4: Simplify right side
    138,572.78x = 14,325,201,487.60
  5. Step 5: Solve for x
    x = 14,325,201,487.60/138,572.78
  6. Step 6: Final answer
    x = 103,376.74

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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.