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Finding the Fourth Proportional to 66,791.19, 100,155.65 and 38,719.28

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Solution

The fourth proportional to 66,791.19, 100,155.65 and 38,719.28 is: 58,060.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,791.19 : 100,155.65 = 38,719.28 : x
  2. Step 2: Convert to fraction form
    66,791.19/100,155.65 = 38,719.28/x
  3. Step 3: Cross multiply
    66,791.19x = 100,155.65 × 38,719.28
  4. Step 4: Simplify right side
    66,791.19x = 3,877,954,712.72
  5. Step 5: Solve for x
    x = 3,877,954,712.72/66,791.19
  6. Step 6: Final answer
    x = 58,060.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.