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Finding the Fourth Proportional to 982.13, 1,355.41 and 688.10

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Solution

The fourth proportional to 982.13, 1,355.41 and 688.10 is: 949.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.13 : 1,355.41 = 688.10 : x
  2. Step 2: Convert to fraction form
    982.13/1,355.41 = 688.10/x
  3. Step 3: Cross multiply
    982.13x = 1,355.41 × 688.10
  4. Step 4: Simplify right side
    982.13x = 932,649.77
  5. Step 5: Solve for x
    x = 932,649.77/982.13
  6. Step 6: Final answer
    x = 949.62

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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.