Home / 100,439.20-138,607.55-55,116.37

Finding the Fourth Proportional to 100,439.20, 138,607.55 and 55,116.37

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Solution

The fourth proportional to 100,439.20, 138,607.55 and 55,116.37 is: 76,061.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,439.20 : 138,607.55 = 55,116.37 : x
  2. Step 2: Convert to fraction form
    100,439.20/138,607.55 = 55,116.37/x
  3. Step 3: Cross multiply
    100,439.20x = 138,607.55 × 55,116.37
  4. Step 4: Simplify right side
    100,439.20x = 7,639,545,010.59
  5. Step 5: Solve for x
    x = 7,639,545,010.59/100,439.20
  6. Step 6: Final answer
    x = 76,061.39

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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.