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Finding the Fourth Proportional to 868.29, 1,299.60 and 637.12

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Solution

The fourth proportional to 868.29, 1,299.60 and 637.12 is: 953.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.29 : 1,299.60 = 637.12 : x
  2. Step 2: Convert to fraction form
    868.29/1,299.60 = 637.12/x
  3. Step 3: Cross multiply
    868.29x = 1,299.60 × 637.12
  4. Step 4: Simplify right side
    868.29x = 828,002.78
  5. Step 5: Solve for x
    x = 828,002.78/868.29
  6. Step 6: Final answer
    x = 953.61

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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.