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Finding the Fourth Proportional to 730.98, 1,008.75 and 399.41

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Solution

The fourth proportional to 730.98, 1,008.75 and 399.41 is: 551.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.98 : 1,008.75 = 399.41 : x
  2. Step 2: Convert to fraction form
    730.98/1,008.75 = 399.41/x
  3. Step 3: Cross multiply
    730.98x = 1,008.75 × 399.41
  4. Step 4: Simplify right side
    730.98x = 402,904.84
  5. Step 5: Solve for x
    x = 402,904.84/730.98
  6. Step 6: Final answer
    x = 551.18

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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.