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Finding the Fourth Proportional to 514.08, 765.60 and 489.12

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Solution

The fourth proportional to 514.08, 765.60 and 489.12 is: 728.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.08 : 765.60 = 489.12 : x
  2. Step 2: Convert to fraction form
    514.08/765.60 = 489.12/x
  3. Step 3: Cross multiply
    514.08x = 765.60 × 489.12
  4. Step 4: Simplify right side
    514.08x = 374,470.27
  5. Step 5: Solve for x
    x = 374,470.27/514.08
  6. Step 6: Final answer
    x = 728.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.