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Finding the Fourth Proportional to 815.85, 1,123.90 and 566.74

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Solution

The fourth proportional to 815.85, 1,123.90 and 566.74 is: 780.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.85 : 1,123.90 = 566.74 : x
  2. Step 2: Convert to fraction form
    815.85/1,123.90 = 566.74/x
  3. Step 3: Cross multiply
    815.85x = 1,123.90 × 566.74
  4. Step 4: Simplify right side
    815.85x = 636,959.09
  5. Step 5: Solve for x
    x = 636,959.09/815.85
  6. Step 6: Final answer
    x = 780.73

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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.