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Finding the Fourth Proportional to 668.46, 1,002.72 and 425.46

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Solution

The fourth proportional to 668.46, 1,002.72 and 425.46 is: 638.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.46 : 1,002.72 = 425.46 : x
  2. Step 2: Convert to fraction form
    668.46/1,002.72 = 425.46/x
  3. Step 3: Cross multiply
    668.46x = 1,002.72 × 425.46
  4. Step 4: Simplify right side
    668.46x = 426,617.25
  5. Step 5: Solve for x
    x = 426,617.25/668.46
  6. Step 6: Final answer
    x = 638.21

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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.