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Finding the Fourth Proportional to 728.58, 1,092.81 and 289.81

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Solution

The fourth proportional to 728.58, 1,092.81 and 289.81 is: 434.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.58 : 1,092.81 = 289.81 : x
  2. Step 2: Convert to fraction form
    728.58/1,092.81 = 289.81/x
  3. Step 3: Cross multiply
    728.58x = 1,092.81 × 289.81
  4. Step 4: Simplify right side
    728.58x = 316,708.09
  5. Step 5: Solve for x
    x = 316,708.09/728.58
  6. Step 6: Final answer
    x = 434.69

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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.