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Finding the Fourth Proportional to 982.90, 1,355.70 and 938.62

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Solution

The fourth proportional to 982.90, 1,355.70 and 938.62 is: 1,294.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.90 : 1,355.70 = 938.62 : x
  2. Step 2: Convert to fraction form
    982.90/1,355.70 = 938.62/x
  3. Step 3: Cross multiply
    982.90x = 1,355.70 × 938.62
  4. Step 4: Simplify right side
    982.90x = 1,272,487.13
  5. Step 5: Solve for x
    x = 1,272,487.13/982.90
  6. Step 6: Final answer
    x = 1,294.63

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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.