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Finding the Fourth Proportional to 666.16, 918.79 and 489.04

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Solution

The fourth proportional to 666.16, 918.79 and 489.04 is: 674.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.16 : 918.79 = 489.04 : x
  2. Step 2: Convert to fraction form
    666.16/918.79 = 489.04/x
  3. Step 3: Cross multiply
    666.16x = 918.79 × 489.04
  4. Step 4: Simplify right side
    666.16x = 449,321.54
  5. Step 5: Solve for x
    x = 449,321.54/666.16
  6. Step 6: Final answer
    x = 674.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.