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Finding the Fourth Proportional to 807.86, 1,211.18 and 547.12

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Solution

The fourth proportional to 807.86, 1,211.18 and 547.12 is: 820.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.86 : 1,211.18 = 547.12 : x
  2. Step 2: Convert to fraction form
    807.86/1,211.18 = 547.12/x
  3. Step 3: Cross multiply
    807.86x = 1,211.18 × 547.12
  4. Step 4: Simplify right side
    807.86x = 662,660.80
  5. Step 5: Solve for x
    x = 662,660.80/807.86
  6. Step 6: Final answer
    x = 820.27

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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.