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Finding the Fourth Proportional to 949.68, 1,311 and 618.56

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Solution

The fourth proportional to 949.68, 1,311 and 618.56 is: 853.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.68 : 1,311 = 618.56 : x
  2. Step 2: Convert to fraction form
    949.68/1,311 = 618.56/x
  3. Step 3: Cross multiply
    949.68x = 1,311 × 618.56
  4. Step 4: Simplify right side
    949.68x = 810,932.16
  5. Step 5: Solve for x
    x = 810,932.16/949.68
  6. Step 6: Final answer
    x = 853.90

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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.