Home / 100,330.18-138,456.05-55,008.86

Finding the Fourth Proportional to 100,330.18, 138,456.05 and 55,008.86

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Solution

The fourth proportional to 100,330.18, 138,456.05 and 55,008.86 is: 75,912.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,330.18 : 138,456.05 = 55,008.86 : x
  2. Step 2: Convert to fraction form
    100,330.18/138,456.05 = 55,008.86/x
  3. Step 3: Cross multiply
    100,330.18x = 138,456.05 × 55,008.86
  4. Step 4: Simplify right side
    100,330.18x = 7,616,309,470.60
  5. Step 5: Solve for x
    x = 7,616,309,470.60/100,330.18
  6. Step 6: Final answer
    x = 75,912.45

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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.