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Finding the Fourth Proportional to 668.02, 1,002.19 and 257.18

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Solution

The fourth proportional to 668.02, 1,002.19 and 257.18 is: 385.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.02 : 1,002.19 = 257.18 : x
  2. Step 2: Convert to fraction form
    668.02/1,002.19 = 257.18/x
  3. Step 3: Cross multiply
    668.02x = 1,002.19 × 257.18
  4. Step 4: Simplify right side
    668.02x = 257,743.22
  5. Step 5: Solve for x
    x = 257,743.22/668.02
  6. Step 6: Final answer
    x = 385.83

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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.