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Finding the Fourth Proportional to 8,617.40, 11,892.12 and 5,080.40

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Solution

The fourth proportional to 8,617.40, 11,892.12 and 5,080.40 is: 7,011.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,617.40 : 11,892.12 = 5,080.40 : x
  2. Step 2: Convert to fraction form
    8,617.40/11,892.12 = 5,080.40/x
  3. Step 3: Cross multiply
    8,617.40x = 11,892.12 × 5,080.40
  4. Step 4: Simplify right side
    8,617.40x = 60,416,726.45
  5. Step 5: Solve for x
    x = 60,416,726.45/8,617.40
  6. Step 6: Final answer
    x = 7,011.02

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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.