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Finding the Fourth Proportional to 814.74, 1,121.76 and 711.20

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Solution

The fourth proportional to 814.74, 1,121.76 and 711.20 is: 979.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.74 : 1,121.76 = 711.20 : x
  2. Step 2: Convert to fraction form
    814.74/1,121.76 = 711.20/x
  3. Step 3: Cross multiply
    814.74x = 1,121.76 × 711.20
  4. Step 4: Simplify right side
    814.74x = 797,795.71
  5. Step 5: Solve for x
    x = 797,795.71/814.74
  6. Step 6: Final answer
    x = 979.20

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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.