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Finding the Fourth Proportional to 949.25, 1,309.14 and 617.55

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Solution

The fourth proportional to 949.25, 1,309.14 and 617.55 is: 851.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.25 : 1,309.14 = 617.55 : x
  2. Step 2: Convert to fraction form
    949.25/1,309.14 = 617.55/x
  3. Step 3: Cross multiply
    949.25x = 1,309.14 × 617.55
  4. Step 4: Simplify right side
    949.25x = 808,459.41
  5. Step 5: Solve for x
    x = 808,459.41/949.25
  6. Step 6: Final answer
    x = 851.69

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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.