Home / 20,385.20-28,130.88-11,434.16

Finding the Fourth Proportional to 20,385.20, 28,130.88 and 11,434.16

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Solution

The fourth proportional to 20,385.20, 28,130.88 and 11,434.16 is: 15,778.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.20 : 28,130.88 = 11,434.16 : x
  2. Step 2: Convert to fraction form
    20,385.20/28,130.88 = 11,434.16/x
  3. Step 3: Cross multiply
    20,385.20x = 28,130.88 × 11,434.16
  4. Step 4: Simplify right side
    20,385.20x = 321,652,982.86
  5. Step 5: Solve for x
    x = 321,652,982.86/20,385.20
  6. Step 6: Final answer
    x = 15,778.75

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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.