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Finding the Fourth Proportional to 25,956.64, 38,928.48 and 8,431.48

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Solution

The fourth proportional to 25,956.64, 38,928.48 and 8,431.48 is: 12,645.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,956.64 : 38,928.48 = 8,431.48 : x
  2. Step 2: Convert to fraction form
    25,956.64/38,928.48 = 8,431.48/x
  3. Step 3: Cross multiply
    25,956.64x = 38,928.48 × 8,431.48
  4. Step 4: Simplify right side
    25,956.64x = 328,224,700.55
  5. Step 5: Solve for x
    x = 328,224,700.55/25,956.64
  6. Step 6: Final answer
    x = 12,645.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.