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Finding the Fourth Proportional to 976.85, 1,348 and 557.15

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Solution

The fourth proportional to 976.85, 1,348 and 557.15 is: 768.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.85 : 1,348 = 557.15 : x
  2. Step 2: Convert to fraction form
    976.85/1,348 = 557.15/x
  3. Step 3: Cross multiply
    976.85x = 1,348 × 557.15
  4. Step 4: Simplify right side
    976.85x = 751,038.20
  5. Step 5: Solve for x
    x = 751,038.20/976.85
  6. Step 6: Final answer
    x = 768.84

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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.