Home / 91,408.20-136,820.70-71,579.40

Finding the Fourth Proportional to 91,408.20, 136,820.70 and 71,579.40

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Solution

The fourth proportional to 91,408.20, 136,820.70 and 71,579.40 is: 107,140.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,408.20 : 136,820.70 = 71,579.40 : x
  2. Step 2: Convert to fraction form
    91,408.20/136,820.70 = 71,579.40/x
  3. Step 3: Cross multiply
    91,408.20x = 136,820.70 × 71,579.40
  4. Step 4: Simplify right side
    91,408.20x = 9,793,543,613.58
  5. Step 5: Solve for x
    x = 9,793,543,613.58/91,408.20
  6. Step 6: Final answer
    x = 107,140.76

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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.