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Finding the Fourth Proportional to 868.15, 1,302.21 and 218.89

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Solution

The fourth proportional to 868.15, 1,302.21 and 218.89 is: 328.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.15 : 1,302.21 = 218.89 : x
  2. Step 2: Convert to fraction form
    868.15/1,302.21 = 218.89/x
  3. Step 3: Cross multiply
    868.15x = 1,302.21 × 218.89
  4. Step 4: Simplify right side
    868.15x = 285,034.24
  5. Step 5: Solve for x
    x = 285,034.24/868.15
  6. Step 6: Final answer
    x = 328.32

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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.