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Finding the Fourth Proportional to 727.96, 1,090.98 and 399.04

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Solution

The fourth proportional to 727.96, 1,090.98 and 399.04 is: 598.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.96 : 1,090.98 = 399.04 : x
  2. Step 2: Convert to fraction form
    727.96/1,090.98 = 399.04/x
  3. Step 3: Cross multiply
    727.96x = 1,090.98 × 399.04
  4. Step 4: Simplify right side
    727.96x = 435,344.66
  5. Step 5: Solve for x
    x = 435,344.66/727.96
  6. Step 6: Final answer
    x = 598.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.