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Finding the Fourth Proportional to 668.72, 1,003.08 and 424.46

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Solution

The fourth proportional to 668.72, 1,003.08 and 424.46 is: 636.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.72 : 1,003.08 = 424.46 : x
  2. Step 2: Convert to fraction form
    668.72/1,003.08 = 424.46/x
  3. Step 3: Cross multiply
    668.72x = 1,003.08 × 424.46
  4. Step 4: Simplify right side
    668.72x = 425,767.34
  5. Step 5: Solve for x
    x = 425,767.34/668.72
  6. Step 6: Final answer
    x = 636.69

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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.