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Finding the Fourth Proportional to 15,082.79, 20,814.80 and 9,113.30

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Solution

The fourth proportional to 15,082.79, 20,814.80 and 9,113.30 is: 12,576.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,082.79 : 20,814.80 = 9,113.30 : x
  2. Step 2: Convert to fraction form
    15,082.79/20,814.80 = 9,113.30/x
  3. Step 3: Cross multiply
    15,082.79x = 20,814.80 × 9,113.30
  4. Step 4: Simplify right side
    15,082.79x = 189,691,367.20
  5. Step 5: Solve for x
    x = 189,691,367.20/15,082.79
  6. Step 6: Final answer
    x = 12,576.68

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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.