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Finding the Fourth Proportional to 976.78, 1,347.97 and 534.72

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Solution

The fourth proportional to 976.78, 1,347.97 and 534.72 is: 737.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.78 : 1,347.97 = 534.72 : x
  2. Step 2: Convert to fraction form
    976.78/1,347.97 = 534.72/x
  3. Step 3: Cross multiply
    976.78x = 1,347.97 × 534.72
  4. Step 4: Simplify right side
    976.78x = 720,786.52
  5. Step 5: Solve for x
    x = 720,786.52/976.78
  6. Step 6: Final answer
    x = 737.92

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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.