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Finding the Fourth Proportional to 728.94, 1,092.72 and 318.32

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Solution

The fourth proportional to 728.94, 1,092.72 and 318.32 is: 477.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.94 : 1,092.72 = 318.32 : x
  2. Step 2: Convert to fraction form
    728.94/1,092.72 = 318.32/x
  3. Step 3: Cross multiply
    728.94x = 1,092.72 × 318.32
  4. Step 4: Simplify right side
    728.94x = 347,834.63
  5. Step 5: Solve for x
    x = 347,834.63/728.94
  6. Step 6: Final answer
    x = 477.18

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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.