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Finding the Fourth Proportional to 868.02, 1,198.45 and 632.40

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Solution

The fourth proportional to 868.02, 1,198.45 and 632.40 is: 873.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.02 : 1,198.45 = 632.40 : x
  2. Step 2: Convert to fraction form
    868.02/1,198.45 = 632.40/x
  3. Step 3: Cross multiply
    868.02x = 1,198.45 × 632.40
  4. Step 4: Simplify right side
    868.02x = 757,899.78
  5. Step 5: Solve for x
    x = 757,899.78/868.02
  6. Step 6: Final answer
    x = 873.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.