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Finding the Fourth Proportional to 613.74, 918.18 and 489.36

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Solution

The fourth proportional to 613.74, 918.18 and 489.36 is: 732.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.74 : 918.18 = 489.36 : x
  2. Step 2: Convert to fraction form
    613.74/918.18 = 489.36/x
  3. Step 3: Cross multiply
    613.74x = 918.18 × 489.36
  4. Step 4: Simplify right side
    613.74x = 449,320.56
  5. Step 5: Solve for x
    x = 449,320.56/613.74
  6. Step 6: Final answer
    x = 732.10

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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.