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Finding the Fourth Proportional to 815.44, 1,125.18 and 461.38

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Solution

The fourth proportional to 815.44, 1,125.18 and 461.38 is: 636.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.44 : 1,125.18 = 461.38 : x
  2. Step 2: Convert to fraction form
    815.44/1,125.18 = 461.38/x
  3. Step 3: Cross multiply
    815.44x = 1,125.18 × 461.38
  4. Step 4: Simplify right side
    815.44x = 519,135.55
  5. Step 5: Solve for x
    x = 519,135.55/815.44
  6. Step 6: Final answer
    x = 636.63

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Double scale
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1.5x scale

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.