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Finding the Fourth Proportional to 813.85, 1,121.14 and 564.74

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Solution

The fourth proportional to 813.85, 1,121.14 and 564.74 is: 777.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.85 : 1,121.14 = 564.74 : x
  2. Step 2: Convert to fraction form
    813.85/1,121.14 = 564.74/x
  3. Step 3: Cross multiply
    813.85x = 1,121.14 × 564.74
  4. Step 4: Simplify right side
    813.85x = 633,151.91
  5. Step 5: Solve for x
    x = 633,151.91/813.85
  6. Step 6: Final answer
    x = 777.97

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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.