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Finding the Fourth Proportional to 666.54, 919.91 and 404.55

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Solution

The fourth proportional to 666.54, 919.91 and 404.55 is: 558.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.54 : 919.91 = 404.55 : x
  2. Step 2: Convert to fraction form
    666.54/919.91 = 404.55/x
  3. Step 3: Cross multiply
    666.54x = 919.91 × 404.55
  4. Step 4: Simplify right side
    666.54x = 372,149.59
  5. Step 5: Solve for x
    x = 372,149.59/666.54
  6. Step 6: Final answer
    x = 558.33

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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.