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Finding the Fourth Proportional to 868.17, 1,301.31 and 319.89

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Solution

The fourth proportional to 868.17, 1,301.31 and 319.89 is: 479.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.17 : 1,301.31 = 319.89 : x
  2. Step 2: Convert to fraction form
    868.17/1,301.31 = 319.89/x
  3. Step 3: Cross multiply
    868.17x = 1,301.31 × 319.89
  4. Step 4: Simplify right side
    868.17x = 416,276.06
  5. Step 5: Solve for x
    x = 416,276.06/868.17
  6. Step 6: Final answer
    x = 479.49

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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.