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Finding the Fourth Proportional to 15,121.20, 21,191.55 and 15,121.20

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Solution

The fourth proportional to 15,121.20, 21,191.55 and 15,121.20 is: 21,191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.20 : 21,191.55 = 15,121.20 : x
  2. Step 2: Convert to fraction form
    15,121.20/21,191.55 = 15,121.20/x
  3. Step 3: Cross multiply
    15,121.20x = 21,191.55 × 15,121.20
  4. Step 4: Simplify right side
    15,121.20x = 320,441,665.86
  5. Step 5: Solve for x
    x = 320,441,665.86/15,121.20
  6. Step 6: Final answer
    x = 21,191.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.