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Finding the Fourth Proportional to 31,872.64, 47,808.96 and 8,499.16

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Solution

The fourth proportional to 31,872.64, 47,808.96 and 8,499.16 is: 12,748.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,872.64 : 47,808.96 = 8,499.16 : x
  2. Step 2: Convert to fraction form
    31,872.64/47,808.96 = 8,499.16/x
  3. Step 3: Cross multiply
    31,872.64x = 47,808.96 × 8,499.16
  4. Step 4: Simplify right side
    31,872.64x = 406,336,000.47
  5. Step 5: Solve for x
    x = 406,336,000.47/31,872.64
  6. Step 6: Final answer
    x = 12,748.74

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1.5x scale

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.