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Finding the Fourth Proportional to 814.50, 1,218.92 and 767.12

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Solution

The fourth proportional to 814.50, 1,218.92 and 767.12 is: 1,148.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.50 : 1,218.92 = 767.12 : x
  2. Step 2: Convert to fraction form
    814.50/1,218.92 = 767.12/x
  3. Step 3: Cross multiply
    814.50x = 1,218.92 × 767.12
  4. Step 4: Simplify right side
    814.50x = 935,047.98
  5. Step 5: Solve for x
    x = 935,047.98/814.50
  6. Step 6: Final answer
    x = 1,148.00

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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.