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Finding the Fourth Proportional to 100,632.38, 138,869.74 and 55,310.34

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Solution

The fourth proportional to 100,632.38, 138,869.74 and 55,310.34 is: 76,326.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,632.38 : 138,869.74 = 55,310.34 : x
  2. Step 2: Convert to fraction form
    100,632.38/138,869.74 = 55,310.34/x
  3. Step 3: Cross multiply
    100,632.38x = 138,869.74 × 55,310.34
  4. Step 4: Simplify right side
    100,632.38x = 7,680,933,125.01
  5. Step 5: Solve for x
    x = 7,680,933,125.01/100,632.38
  6. Step 6: Final answer
    x = 76,326.66

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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.