Home / 20,459.20-28,235.12-11,385.72

Finding the Fourth Proportional to 20,459.20, 28,235.12 and 11,385.72

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Solution

The fourth proportional to 20,459.20, 28,235.12 and 11,385.72 is: 15,713.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,459.20 : 28,235.12 = 11,385.72 : x
  2. Step 2: Convert to fraction form
    20,459.20/28,235.12 = 11,385.72/x
  3. Step 3: Cross multiply
    20,459.20x = 28,235.12 × 11,385.72
  4. Step 4: Simplify right side
    20,459.20x = 321,477,170.49
  5. Step 5: Solve for x
    x = 321,477,170.49/20,459.20
  6. Step 6: Final answer
    x = 15,713.09

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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.