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Finding the Fourth Proportional to 5,142.47, 7,713.70 and 1,679.72

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Solution

The fourth proportional to 5,142.47, 7,713.70 and 1,679.72 is: 2,519.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,142.47 : 7,713.70 = 1,679.72 : x
  2. Step 2: Convert to fraction form
    5,142.47/7,713.70 = 1,679.72/x
  3. Step 3: Cross multiply
    5,142.47x = 7,713.70 × 1,679.72
  4. Step 4: Simplify right side
    5,142.47x = 12,956,856.16
  5. Step 5: Solve for x
    x = 12,956,856.16/5,142.47
  6. Step 6: Final answer
    x = 2,519.58

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Similar ratio
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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.