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Finding the Fourth Proportional to 406.80, 561.58 and 266.93

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Solution

The fourth proportional to 406.80, 561.58 and 266.93 is: 368.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.80 : 561.58 = 266.93 : x
  2. Step 2: Convert to fraction form
    406.80/561.58 = 266.93/x
  3. Step 3: Cross multiply
    406.80x = 561.58 × 266.93
  4. Step 4: Simplify right side
    406.80x = 149,902.55
  5. Step 5: Solve for x
    x = 149,902.55/406.80
  6. Step 6: Final answer
    x = 368.49

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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.