Home / 20,920.32-28,870.56-11,489.76

Finding the Fourth Proportional to 20,920.32, 28,870.56 and 11,489.76

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Solution

The fourth proportional to 20,920.32, 28,870.56 and 11,489.76 is: 15,856.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.32 : 28,870.56 = 11,489.76 : x
  2. Step 2: Convert to fraction form
    20,920.32/28,870.56 = 11,489.76/x
  3. Step 3: Cross multiply
    20,920.32x = 28,870.56 × 11,489.76
  4. Step 4: Simplify right side
    20,920.32x = 331,715,805.47
  5. Step 5: Solve for x
    x = 331,715,805.47/20,920.32
  6. Step 6: Final answer
    x = 15,856.15

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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.