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Finding the Fourth Proportional to 730.91, 1,008.61 and 399.32

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Solution

The fourth proportional to 730.91, 1,008.61 and 399.32 is: 551.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.91 : 1,008.61 = 399.32 : x
  2. Step 2: Convert to fraction form
    730.91/1,008.61 = 399.32/x
  3. Step 3: Cross multiply
    730.91x = 1,008.61 × 399.32
  4. Step 4: Simplify right side
    730.91x = 402,758.15
  5. Step 5: Solve for x
    x = 402,758.15/730.91
  6. Step 6: Final answer
    x = 551.04

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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.