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Finding the Fourth Proportional to 815.21, 1,125 and 461.15

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Solution

The fourth proportional to 815.21, 1,125 and 461.15 is: 636.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.21 : 1,125 = 461.15 : x
  2. Step 2: Convert to fraction form
    815.21/1,125 = 461.15/x
  3. Step 3: Cross multiply
    815.21x = 1,125 × 461.15
  4. Step 4: Simplify right side
    815.21x = 518,796.56
  5. Step 5: Solve for x
    x = 518,796.56/815.21
  6. Step 6: Final answer
    x = 636.39

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Double scale
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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.