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Finding the Fourth Proportional to 666.80, 919.59 and 404.36

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Solution

The fourth proportional to 666.80, 919.59 and 404.36 is: 557.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.80 : 919.59 = 404.36 : x
  2. Step 2: Convert to fraction form
    666.80/919.59 = 404.36/x
  3. Step 3: Cross multiply
    666.80x = 919.59 × 404.36
  4. Step 4: Simplify right side
    666.80x = 371,845.41
  5. Step 5: Solve for x
    x = 371,845.41/666.80
  6. Step 6: Final answer
    x = 557.66

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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.