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Finding the Fourth Proportional to 18,686.64, 25,824.72 and 15,324.24

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Solution

The fourth proportional to 18,686.64, 25,824.72 and 15,324.24 is: 21,177.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.64 : 25,824.72 = 15,324.24 : x
  2. Step 2: Convert to fraction form
    18,686.64/25,824.72 = 15,324.24/x
  3. Step 3: Cross multiply
    18,686.64x = 25,824.72 × 15,324.24
  4. Step 4: Simplify right side
    18,686.64x = 395,744,207.21
  5. Step 5: Solve for x
    x = 395,744,207.21/18,686.64
  6. Step 6: Final answer
    x = 21,177.92

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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.