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Finding the Fourth Proportional to 505.92, 759.12 and 489.36

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Solution

The fourth proportional to 505.92, 759.12 and 489.36 is: 734.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.92 : 759.12 = 489.36 : x
  2. Step 2: Convert to fraction form
    505.92/759.12 = 489.36/x
  3. Step 3: Cross multiply
    505.92x = 759.12 × 489.36
  4. Step 4: Simplify right side
    505.92x = 371,482.96
  5. Step 5: Solve for x
    x = 371,482.96/505.92
  6. Step 6: Final answer
    x = 734.27

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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.