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Finding the Fourth Proportional to 15,129.80, 20,883.12 and 10,654.88

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Solution

The fourth proportional to 15,129.80, 20,883.12 and 10,654.88 is: 14,706.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129.80 : 20,883.12 = 10,654.88 : x
  2. Step 2: Convert to fraction form
    15,129.80/20,883.12 = 10,654.88/x
  3. Step 3: Cross multiply
    15,129.80x = 20,883.12 × 10,654.88
  4. Step 4: Simplify right side
    15,129.80x = 222,507,137.63
  5. Step 5: Solve for x
    x = 222,507,137.63/15,129.80
  6. Step 6: Final answer
    x = 14,706.55

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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.