Home / 20,778.10-31,167.15-12,483.70

Finding the Fourth Proportional to 20,778.10, 31,167.15 and 12,483.70

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Solution

The fourth proportional to 20,778.10, 31,167.15 and 12,483.70 is: 18,725.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.10 : 31,167.15 = 12,483.70 : x
  2. Step 2: Convert to fraction form
    20,778.10/31,167.15 = 12,483.70/x
  3. Step 3: Cross multiply
    20,778.10x = 31,167.15 × 12,483.70
  4. Step 4: Simplify right side
    20,778.10x = 389,081,350.46
  5. Step 5: Solve for x
    x = 389,081,350.46/20,778.10
  6. Step 6: Final answer
    x = 18,725.55

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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.