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Finding the Fourth Proportional to 668.19, 1,001.97 and 278.13

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Solution

The fourth proportional to 668.19, 1,001.97 and 278.13 is: 417.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.19 : 1,001.97 = 278.13 : x
  2. Step 2: Convert to fraction form
    668.19/1,001.97 = 278.13/x
  3. Step 3: Cross multiply
    668.19x = 1,001.97 × 278.13
  4. Step 4: Simplify right side
    668.19x = 278,677.92
  5. Step 5: Solve for x
    x = 278,677.92/668.19
  6. Step 6: Final answer
    x = 417.06

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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.