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Finding the Fourth Proportional to 872.90, 1,308.37 and 461.15

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Solution

The fourth proportional to 872.90, 1,308.37 and 461.15 is: 691.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.90 : 1,308.37 = 461.15 : x
  2. Step 2: Convert to fraction form
    872.90/1,308.37 = 461.15/x
  3. Step 3: Cross multiply
    872.90x = 1,308.37 × 461.15
  4. Step 4: Simplify right side
    872.90x = 603,352.52
  5. Step 5: Solve for x
    x = 603,352.52/872.90
  6. Step 6: Final answer
    x = 691.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.