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Finding the Fourth Proportional to 976.90, 1,348.12 and 534.80

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Solution

The fourth proportional to 976.90, 1,348.12 and 534.80 is: 738.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.90 : 1,348.12 = 534.80 : x
  2. Step 2: Convert to fraction form
    976.90/1,348.12 = 534.80/x
  3. Step 3: Cross multiply
    976.90x = 1,348.12 × 534.80
  4. Step 4: Simplify right side
    976.90x = 720,965.16
  5. Step 5: Solve for x
    x = 720,965.16/976.90
  6. Step 6: Final answer
    x = 738.02

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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.