Home / 100,658.09-138,910.85-54,720.83

Finding the Fourth Proportional to 100,658.09, 138,910.85 and 54,720.83

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Solution

The fourth proportional to 100,658.09, 138,910.85 and 54,720.83 is: 75,516.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,658.09 : 138,910.85 = 54,720.83 : x
  2. Step 2: Convert to fraction form
    100,658.09/138,910.85 = 54,720.83/x
  3. Step 3: Cross multiply
    100,658.09x = 138,910.85 × 54,720.83
  4. Step 4: Simplify right side
    100,658.09x = 7,601,316,039.85
  5. Step 5: Solve for x
    x = 7,601,316,039.85/100,658.09
  6. Step 6: Final answer
    x = 75,516.20

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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.