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Finding the Fourth Proportional to 729.37, 1,006.53 and 397.78

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Solution

The fourth proportional to 729.37, 1,006.53 and 397.78 is: 548.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.37 : 1,006.53 = 397.78 : x
  2. Step 2: Convert to fraction form
    729.37/1,006.53 = 397.78/x
  3. Step 3: Cross multiply
    729.37x = 1,006.53 × 397.78
  4. Step 4: Simplify right side
    729.37x = 400,373.50
  5. Step 5: Solve for x
    x = 400,373.50/729.37
  6. Step 6: Final answer
    x = 548.93

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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.