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Finding the Fourth Proportional to 662.65, 913.78 and 400.61

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Solution

The fourth proportional to 662.65, 913.78 and 400.61 is: 552.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.65 : 913.78 = 400.61 : x
  2. Step 2: Convert to fraction form
    662.65/913.78 = 400.61/x
  3. Step 3: Cross multiply
    662.65x = 913.78 × 400.61
  4. Step 4: Simplify right side
    662.65x = 366,072.19
  5. Step 5: Solve for x
    x = 366,072.19/662.65
  6. Step 6: Final answer
    x = 552.44

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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.