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Finding the Fourth Proportional to 815.55, 1,125.14 and 628.85

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Solution

The fourth proportional to 815.55, 1,125.14 and 628.85 is: 867.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.55 : 1,125.14 = 628.85 : x
  2. Step 2: Convert to fraction form
    815.55/1,125.14 = 628.85/x
  3. Step 3: Cross multiply
    815.55x = 1,125.14 × 628.85
  4. Step 4: Simplify right side
    815.55x = 707,535.52
  5. Step 5: Solve for x
    x = 707,535.52/815.55
  6. Step 6: Final answer
    x = 867.56

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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.