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Finding the Fourth Proportional to 730.79, 1,008.48 and 399.23

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Solution

The fourth proportional to 730.79, 1,008.48 and 399.23 is: 550.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.79 : 1,008.48 = 399.23 : x
  2. Step 2: Convert to fraction form
    730.79/1,008.48 = 399.23/x
  3. Step 3: Cross multiply
    730.79x = 1,008.48 × 399.23
  4. Step 4: Simplify right side
    730.79x = 402,614.96
  5. Step 5: Solve for x
    x = 402,614.96/730.79
  6. Step 6: Final answer
    x = 550.93

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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.