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Finding the Fourth Proportional to 668.60, 1,002.89 and 618.48

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Solution

The fourth proportional to 668.60, 1,002.89 and 618.48 is: 927.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.60 : 1,002.89 = 618.48 : x
  2. Step 2: Convert to fraction form
    668.60/1,002.89 = 618.48/x
  3. Step 3: Cross multiply
    668.60x = 1,002.89 × 618.48
  4. Step 4: Simplify right side
    668.60x = 620,268.95
  5. Step 5: Solve for x
    x = 620,268.95/668.60
  6. Step 6: Final answer
    x = 927.72

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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.