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Finding the Fourth Proportional to 815.81, 1,125.81 and 442.79

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Solution

The fourth proportional to 815.81, 1,125.81 and 442.79 is: 611.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.81 : 1,125.81 = 442.79 : x
  2. Step 2: Convert to fraction form
    815.81/1,125.81 = 442.79/x
  3. Step 3: Cross multiply
    815.81x = 1,125.81 × 442.79
  4. Step 4: Simplify right side
    815.81x = 498,491.78
  5. Step 5: Solve for x
    x = 498,491.78/815.81
  6. Step 6: Final answer
    x = 611.04

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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.