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Finding the Fourth Proportional to 728.04, 1,091 and 398.70

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Solution

The fourth proportional to 728.04, 1,091 and 398.70 is: 597.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.04 : 1,091 = 398.70 : x
  2. Step 2: Convert to fraction form
    728.04/1,091 = 398.70/x
  3. Step 3: Cross multiply
    728.04x = 1,091 × 398.70
  4. Step 4: Simplify right side
    728.04x = 434,981.70
  5. Step 5: Solve for x
    x = 434,981.70/728.04
  6. Step 6: Final answer
    x = 597.47

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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.