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Finding the Fourth Proportional to 868.61, 1,302.50 and 252.15

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Solution

The fourth proportional to 868.61, 1,302.50 and 252.15 is: 378.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.61 : 1,302.50 = 252.15 : x
  2. Step 2: Convert to fraction form
    868.61/1,302.50 = 252.15/x
  3. Step 3: Cross multiply
    868.61x = 1,302.50 × 252.15
  4. Step 4: Simplify right side
    868.61x = 328,425.38
  5. Step 5: Solve for x
    x = 328,425.38/868.61
  6. Step 6: Final answer
    x = 378.10

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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.