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Finding the Fourth Proportional to 10,243.20, 15,343.20 and 8,515.20

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Solution

The fourth proportional to 10,243.20, 15,343.20 and 8,515.20 is: 12,754.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,243.20 : 15,343.20 = 8,515.20 : x
  2. Step 2: Convert to fraction form
    10,243.20/15,343.20 = 8,515.20/x
  3. Step 3: Cross multiply
    10,243.20x = 15,343.20 × 8,515.20
  4. Step 4: Simplify right side
    10,243.20x = 130,650,416.64
  5. Step 5: Solve for x
    x = 130,650,416.64/10,243.20
  6. Step 6: Final answer
    x = 12,754.84

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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.