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Finding the Fourth Proportional to 406.60, 561.11 and 266.80

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Solution

The fourth proportional to 406.60, 561.11 and 266.80 is: 368.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.60 : 561.11 = 266.80 : x
  2. Step 2: Convert to fraction form
    406.60/561.11 = 266.80/x
  3. Step 3: Cross multiply
    406.60x = 561.11 × 266.80
  4. Step 4: Simplify right side
    406.60x = 149,704.15
  5. Step 5: Solve for x
    x = 149,704.15/406.60
  6. Step 6: Final answer
    x = 368.19

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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.