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Finding the Fourth Proportional to 20,990.52, 28,966.95 and 11,559.12

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Solution

The fourth proportional to 20,990.52, 28,966.95 and 11,559.12 is: 15,951.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.52 : 28,966.95 = 11,559.12 : x
  2. Step 2: Convert to fraction form
    20,990.52/28,966.95 = 11,559.12/x
  3. Step 3: Cross multiply
    20,990.52x = 28,966.95 × 11,559.12
  4. Step 4: Simplify right side
    20,990.52x = 334,832,451.08
  5. Step 5: Solve for x
    x = 334,832,451.08/20,990.52
  6. Step 6: Final answer
    x = 15,951.60

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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.