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Finding the Fourth Proportional to 730.84, 1,008.52 and 399.21

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Solution

The fourth proportional to 730.84, 1,008.52 and 399.21 is: 550.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.84 : 1,008.52 = 399.21 : x
  2. Step 2: Convert to fraction form
    730.84/1,008.52 = 399.21/x
  3. Step 3: Cross multiply
    730.84x = 1,008.52 × 399.21
  4. Step 4: Simplify right side
    730.84x = 402,607.22
  5. Step 5: Solve for x
    x = 402,607.22/730.84
  6. Step 6: Final answer
    x = 550.88

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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.