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Finding the Fourth Proportional to 949.31, 1,308.90 and 617.61

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Solution

The fourth proportional to 949.31, 1,308.90 and 617.61 is: 851.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.31 : 1,308.90 = 617.61 : x
  2. Step 2: Convert to fraction form
    949.31/1,308.90 = 617.61/x
  3. Step 3: Cross multiply
    949.31x = 1,308.90 × 617.61
  4. Step 4: Simplify right side
    949.31x = 808,389.73
  5. Step 5: Solve for x
    x = 808,389.73/949.31
  6. Step 6: Final answer
    x = 851.56

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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.