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Finding the Fourth Proportional to 15,009.20, 20,713.60 and 9,043.28

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Solution

The fourth proportional to 15,009.20, 20,713.60 and 9,043.28 is: 12,480.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,009.20 : 20,713.60 = 9,043.28 : x
  2. Step 2: Convert to fraction form
    15,009.20/20,713.60 = 9,043.28/x
  3. Step 3: Cross multiply
    15,009.20x = 20,713.60 × 9,043.28
  4. Step 4: Simplify right side
    15,009.20x = 187,318,884.61
  5. Step 5: Solve for x
    x = 187,318,884.61/15,009.20
  6. Step 6: Final answer
    x = 12,480.27

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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.