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Finding the Fourth Proportional to 982.76, 1,472.21 and 571.03

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Solution

The fourth proportional to 982.76, 1,472.21 and 571.03 is: 855.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.76 : 1,472.21 = 571.03 : x
  2. Step 2: Convert to fraction form
    982.76/1,472.21 = 571.03/x
  3. Step 3: Cross multiply
    982.76x = 1,472.21 × 571.03
  4. Step 4: Simplify right side
    982.76x = 840,673.22
  5. Step 5: Solve for x
    x = 840,673.22/982.76
  6. Step 6: Final answer
    x = 855.43

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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.