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Finding the Fourth Proportional to 79,139.70, 109,223.18 and 45,140.38

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Solution

The fourth proportional to 79,139.70, 109,223.18 and 45,140.38 is: 62,299.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,139.70 : 109,223.18 = 45,140.38 : x
  2. Step 2: Convert to fraction form
    79,139.70/109,223.18 = 45,140.38/x
  3. Step 3: Cross multiply
    79,139.70x = 109,223.18 × 45,140.38
  4. Step 4: Simplify right side
    79,139.70x = 4,930,375,520.52
  5. Step 5: Solve for x
    x = 4,930,375,520.52/79,139.70
  6. Step 6: Final answer
    x = 62,299.65

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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.