Home / 20,805.15-28,711.05-11,373.71

Finding the Fourth Proportional to 20,805.15, 28,711.05 and 11,373.71

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Solution

The fourth proportional to 20,805.15, 28,711.05 and 11,373.71 is: 15,695.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.15 : 28,711.05 = 11,373.71 : x
  2. Step 2: Convert to fraction form
    20,805.15/28,711.05 = 11,373.71/x
  3. Step 3: Cross multiply
    20,805.15x = 28,711.05 × 11,373.71
  4. Step 4: Simplify right side
    20,805.15x = 326,551,012.94
  5. Step 5: Solve for x
    x = 326,551,012.94/20,805.15
  6. Step 6: Final answer
    x = 15,695.68

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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.