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Finding the Fourth Proportional to 827.77, 1,242.28 and 437.72

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Solution

The fourth proportional to 827.77, 1,242.28 and 437.72 is: 656.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.77 : 1,242.28 = 437.72 : x
  2. Step 2: Convert to fraction form
    827.77/1,242.28 = 437.72/x
  3. Step 3: Cross multiply
    827.77x = 1,242.28 × 437.72
  4. Step 4: Simplify right side
    827.77x = 543,770.80
  5. Step 5: Solve for x
    x = 543,770.80/827.77
  6. Step 6: Final answer
    x = 656.91

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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.