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Finding the Fourth Proportional to 406.66, 561.04 and 231.91

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Solution

The fourth proportional to 406.66, 561.04 and 231.91 is: 319.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.66 : 561.04 = 231.91 : x
  2. Step 2: Convert to fraction form
    406.66/561.04 = 231.91/x
  3. Step 3: Cross multiply
    406.66x = 561.04 × 231.91
  4. Step 4: Simplify right side
    406.66x = 130,110.21
  5. Step 5: Solve for x
    x = 130,110.21/406.66
  6. Step 6: Final answer
    x = 319.95

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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.