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Finding the Fourth Proportional to 872.77, 1,310.12 and 461.80

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Solution

The fourth proportional to 872.77, 1,310.12 and 461.80 is: 693.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.77 : 1,310.12 = 461.80 : x
  2. Step 2: Convert to fraction form
    872.77/1,310.12 = 461.80/x
  3. Step 3: Cross multiply
    872.77x = 1,310.12 × 461.80
  4. Step 4: Simplify right side
    872.77x = 605,013.42
  5. Step 5: Solve for x
    x = 605,013.42/872.77
  6. Step 6: Final answer
    x = 693.21

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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.