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Finding the Fourth Proportional to 722.40, 1,083.96 and 398.08

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Solution

The fourth proportional to 722.40, 1,083.96 and 398.08 is: 597.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.40 : 1,083.96 = 398.08 : x
  2. Step 2: Convert to fraction form
    722.40/1,083.96 = 398.08/x
  3. Step 3: Cross multiply
    722.40x = 1,083.96 × 398.08
  4. Step 4: Simplify right side
    722.40x = 431,502.80
  5. Step 5: Solve for x
    x = 431,502.80/722.40
  6. Step 6: Final answer
    x = 597.32

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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.