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Finding the Fourth Proportional to 868.02, 1,197.63 and 557.70

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Solution

The fourth proportional to 868.02, 1,197.63 and 557.70 is: 769.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.02 : 1,197.63 = 557.70 : x
  2. Step 2: Convert to fraction form
    868.02/1,197.63 = 557.70/x
  3. Step 3: Cross multiply
    868.02x = 1,197.63 × 557.70
  4. Step 4: Simplify right side
    868.02x = 667,918.25
  5. Step 5: Solve for x
    x = 667,918.25/868.02
  6. Step 6: Final answer
    x = 769.47

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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.