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Finding the Fourth Proportional to 976.89, 1,348.02 and 557.31

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Solution

The fourth proportional to 976.89, 1,348.02 and 557.31 is: 769.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.89 : 1,348.02 = 557.31 : x
  2. Step 2: Convert to fraction form
    976.89/1,348.02 = 557.31/x
  3. Step 3: Cross multiply
    976.89x = 1,348.02 × 557.31
  4. Step 4: Simplify right side
    976.89x = 751,265.03
  5. Step 5: Solve for x
    x = 751,265.03/976.89
  6. Step 6: Final answer
    x = 769.04

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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.