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Finding the Fourth Proportional to 229.41, 316.51 and 129.78

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Solution

The fourth proportional to 229.41, 316.51 and 129.78 is: 179.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.41 : 316.51 = 129.78 : x
  2. Step 2: Convert to fraction form
    229.41/316.51 = 129.78/x
  3. Step 3: Cross multiply
    229.41x = 316.51 × 129.78
  4. Step 4: Simplify right side
    229.41x = 41,075.45
  5. Step 5: Solve for x
    x = 41,075.45/229.41
  6. Step 6: Final answer
    x = 179.05

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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.