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Finding the Fourth Proportional to 666.08, 919.11 and 400.48

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Solution

The fourth proportional to 666.08, 919.11 and 400.48 is: 552.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.08 : 919.11 = 400.48 : x
  2. Step 2: Convert to fraction form
    666.08/919.11 = 400.48/x
  3. Step 3: Cross multiply
    666.08x = 919.11 × 400.48
  4. Step 4: Simplify right side
    666.08x = 368,084.38
  5. Step 5: Solve for x
    x = 368,084.38/666.08
  6. Step 6: Final answer
    x = 552.61

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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.