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Finding the Fourth Proportional to 8,720.31, 13,080.46 and 7,175.06

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Solution

The fourth proportional to 8,720.31, 13,080.46 and 7,175.06 is: 10,762.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.31 : 13,080.46 = 7,175.06 : x
  2. Step 2: Convert to fraction form
    8,720.31/13,080.46 = 7,175.06/x
  3. Step 3: Cross multiply
    8,720.31x = 13,080.46 × 7,175.06
  4. Step 4: Simplify right side
    8,720.31x = 93,853,049.45
  5. Step 5: Solve for x
    x = 93,853,049.45/8,720.31
  6. Step 6: Final answer
    x = 10,762.59

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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.