Home / 20,385.76-28,132.36-11,311.74

Finding the Fourth Proportional to 20,385.76, 28,132.36 and 11,311.74

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Solution

The fourth proportional to 20,385.76, 28,132.36 and 11,311.74 is: 15,610.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.76 : 28,132.36 = 11,311.74 : x
  2. Step 2: Convert to fraction form
    20,385.76/28,132.36 = 11,311.74/x
  3. Step 3: Cross multiply
    20,385.76x = 28,132.36 × 11,311.74
  4. Step 4: Simplify right side
    20,385.76x = 318,225,941.91
  5. Step 5: Solve for x
    x = 318,225,941.91/20,385.76
  6. Step 6: Final answer
    x = 15,610.21

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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.