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Finding the Fourth Proportional to 100,243.46, 138,311.61 and 55,531.46

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Solution

The fourth proportional to 100,243.46, 138,311.61 and 55,531.46 is: 76,619.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,243.46 : 138,311.61 = 55,531.46 : x
  2. Step 2: Convert to fraction form
    100,243.46/138,311.61 = 55,531.46/x
  3. Step 3: Cross multiply
    100,243.46x = 138,311.61 × 55,531.46
  4. Step 4: Simplify right side
    100,243.46x = 7,680,645,638.25
  5. Step 5: Solve for x
    x = 7,680,645,638.25/100,243.46
  6. Step 6: Final answer
    x = 76,619.92

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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.