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Finding the Fourth Proportional to 984.89, 1,474.90 and 572.78

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Solution

The fourth proportional to 984.89, 1,474.90 and 572.78 is: 857.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.89 : 1,474.90 = 572.78 : x
  2. Step 2: Convert to fraction form
    984.89/1,474.90 = 572.78/x
  3. Step 3: Cross multiply
    984.89x = 1,474.90 × 572.78
  4. Step 4: Simplify right side
    984.89x = 844,793.22
  5. Step 5: Solve for x
    x = 844,793.22/984.89
  6. Step 6: Final answer
    x = 857.75

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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.