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Finding the Fourth Proportional to 406.46, 560.90 and 231.80

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Solution

The fourth proportional to 406.46, 560.90 and 231.80 is: 319.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.46 : 560.90 = 231.80 : x
  2. Step 2: Convert to fraction form
    406.46/560.90 = 231.80/x
  3. Step 3: Cross multiply
    406.46x = 560.90 × 231.80
  4. Step 4: Simplify right side
    406.46x = 130,018.60
  5. Step 5: Solve for x
    x = 130,018.60/406.46
  6. Step 6: Final answer
    x = 319.88

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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.