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Finding the Fourth Proportional to 730.91, 1,008.65 and 399.34

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Solution

The fourth proportional to 730.91, 1,008.65 and 399.34 is: 551.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.91 : 1,008.65 = 399.34 : x
  2. Step 2: Convert to fraction form
    730.91/1,008.65 = 399.34/x
  3. Step 3: Cross multiply
    730.91x = 1,008.65 × 399.34
  4. Step 4: Simplify right side
    730.91x = 402,794.29
  5. Step 5: Solve for x
    x = 402,794.29/730.91
  6. Step 6: Final answer
    x = 551.09

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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.