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Finding the Fourth Proportional to 15,352.80, 21,177 and 9,381.12

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Solution

The fourth proportional to 15,352.80, 21,177 and 9,381.12 is: 12,939.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,352.80 : 21,177 = 9,381.12 : x
  2. Step 2: Convert to fraction form
    15,352.80/21,177 = 9,381.12/x
  3. Step 3: Cross multiply
    15,352.80x = 21,177 × 9,381.12
  4. Step 4: Simplify right side
    15,352.80x = 198,663,978.24
  5. Step 5: Solve for x
    x = 198,663,978.24/15,352.80
  6. Step 6: Final answer
    x = 12,939.92

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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.