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Finding the Fourth Proportional to 815.82, 1,125.87 and 479.91

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Solution

The fourth proportional to 815.82, 1,125.87 and 479.91 is: 662.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.82 : 1,125.87 = 479.91 : x
  2. Step 2: Convert to fraction form
    815.82/1,125.87 = 479.91/x
  3. Step 3: Cross multiply
    815.82x = 1,125.87 × 479.91
  4. Step 4: Simplify right side
    815.82x = 540,316.27
  5. Step 5: Solve for x
    x = 540,316.27/815.82
  6. Step 6: Final answer
    x = 662.30

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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.