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Finding the Fourth Proportional to 406.91, 561.62 and 266.78

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Solution

The fourth proportional to 406.91, 561.62 and 266.78 is: 368.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.91 : 561.62 = 266.78 : x
  2. Step 2: Convert to fraction form
    406.91/561.62 = 266.78/x
  3. Step 3: Cross multiply
    406.91x = 561.62 × 266.78
  4. Step 4: Simplify right side
    406.91x = 149,827.65
  5. Step 5: Solve for x
    x = 149,827.65/406.91
  6. Step 6: Final answer
    x = 368.21

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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.