Home / 80,505.18-120,781.80-38,438.64

Finding the Fourth Proportional to 80,505.18, 120,781.80 and 38,438.64

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Solution

The fourth proportional to 80,505.18, 120,781.80 and 38,438.64 is: 57,669.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,505.18 : 120,781.80 = 38,438.64 : x
  2. Step 2: Convert to fraction form
    80,505.18/120,781.80 = 38,438.64/x
  3. Step 3: Cross multiply
    80,505.18x = 120,781.80 × 38,438.64
  4. Step 4: Simplify right side
    80,505.18x = 4,642,688,128.75
  5. Step 5: Solve for x
    x = 4,642,688,128.75/80,505.18
  6. Step 6: Final answer
    x = 57,669.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.