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Finding the Fourth Proportional to 100,381.73, 138,557.80 and 64,571.74

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Solution

The fourth proportional to 100,381.73, 138,557.80 and 64,571.74 is: 89,128.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,381.73 : 138,557.80 = 64,571.74 : x
  2. Step 2: Convert to fraction form
    100,381.73/138,557.80 = 64,571.74/x
  3. Step 3: Cross multiply
    100,381.73x = 138,557.80 × 64,571.74
  4. Step 4: Simplify right side
    100,381.73x = 8,946,917,890.18
  5. Step 5: Solve for x
    x = 8,946,917,890.18/100,381.73
  6. Step 6: Final answer
    x = 89,128.95

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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.