Home / 20,561.16-28,374.30-11,129.70

Finding the Fourth Proportional to 20,561.16, 28,374.30 and 11,129.70

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Solution

The fourth proportional to 20,561.16, 28,374.30 and 11,129.70 is: 15,358.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.16 : 28,374.30 = 11,129.70 : x
  2. Step 2: Convert to fraction form
    20,561.16/28,374.30 = 11,129.70/x
  3. Step 3: Cross multiply
    20,561.16x = 28,374.30 × 11,129.70
  4. Step 4: Simplify right side
    20,561.16x = 315,797,446.71
  5. Step 5: Solve for x
    x = 315,797,446.71/20,561.16
  6. Step 6: Final answer
    x = 15,358.93

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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.