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Finding the Fourth Proportional to 730.59, 1,008.21 and 399.03

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Solution

The fourth proportional to 730.59, 1,008.21 and 399.03 is: 550.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.59 : 1,008.21 = 399.03 : x
  2. Step 2: Convert to fraction form
    730.59/1,008.21 = 399.03/x
  3. Step 3: Cross multiply
    730.59x = 1,008.21 × 399.03
  4. Step 4: Simplify right side
    730.59x = 402,306.04
  5. Step 5: Solve for x
    x = 402,306.04/730.59
  6. Step 6: Final answer
    x = 550.66

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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.