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Finding the Fourth Proportional to 666.55, 919.92 and 404.51

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Solution

The fourth proportional to 666.55, 919.92 and 404.51 is: 558.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.55 : 919.92 = 404.51 : x
  2. Step 2: Convert to fraction form
    666.55/919.92 = 404.51/x
  3. Step 3: Cross multiply
    666.55x = 919.92 × 404.51
  4. Step 4: Simplify right side
    666.55x = 372,116.84
  5. Step 5: Solve for x
    x = 372,116.84/666.55
  6. Step 6: Final answer
    x = 558.27

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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.