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Finding the Fourth Proportional to 730.72, 1,008.42 and 399.16

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Solution

The fourth proportional to 730.72, 1,008.42 and 399.16 is: 550.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.72 : 1,008.42 = 399.16 : x
  2. Step 2: Convert to fraction form
    730.72/1,008.42 = 399.16/x
  3. Step 3: Cross multiply
    730.72x = 1,008.42 × 399.16
  4. Step 4: Simplify right side
    730.72x = 402,520.93
  5. Step 5: Solve for x
    x = 402,520.93/730.72
  6. Step 6: Final answer
    x = 550.86

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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.