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Finding the Fourth Proportional to 729, 1,005.99 and 397.43

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Solution

The fourth proportional to 729, 1,005.99 and 397.43 is: 548.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    729 : 1,005.99 = 397.43 : x
  2. Step 2: Convert to fraction form
    729/1,005.99 = 397.43/x
  3. Step 3: Cross multiply
    729x = 1,005.99 × 397.43
  4. Step 4: Simplify right side
    729x = 399,813.12
  5. Step 5: Solve for x
    x = 399,813.12/729
  6. Step 6: Final answer
    x = 548.44

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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.