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Finding the Fourth Proportional to 668.28, 1,000.70 and 494.69

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Solution

The fourth proportional to 668.28, 1,000.70 and 494.69 is: 740.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.28 : 1,000.70 = 494.69 : x
  2. Step 2: Convert to fraction form
    668.28/1,000.70 = 494.69/x
  3. Step 3: Cross multiply
    668.28x = 1,000.70 × 494.69
  4. Step 4: Simplify right side
    668.28x = 495,028.81
  5. Step 5: Solve for x
    x = 495,028.81/668.28
  6. Step 6: Final answer
    x = 740.75

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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.