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Finding the Fourth Proportional to 18,808.80, 28,191.28 and 15,115.20

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Solution

The fourth proportional to 18,808.80, 28,191.28 and 15,115.20 is: 22,655.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,808.80 : 28,191.28 = 15,115.20 : x
  2. Step 2: Convert to fraction form
    18,808.80/28,191.28 = 15,115.20/x
  3. Step 3: Cross multiply
    18,808.80x = 28,191.28 × 15,115.20
  4. Step 4: Simplify right side
    18,808.80x = 426,116,835.46
  5. Step 5: Solve for x
    x = 426,116,835.46/18,808.80
  6. Step 6: Final answer
    x = 22,655.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.