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Finding the Fourth Proportional to 199.12, 274.72 and 129.16

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Solution

The fourth proportional to 199.12, 274.72 and 129.16 is: 178.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.12 : 274.72 = 129.16 : x
  2. Step 2: Convert to fraction form
    199.12/274.72 = 129.16/x
  3. Step 3: Cross multiply
    199.12x = 274.72 × 129.16
  4. Step 4: Simplify right side
    199.12x = 35,482.84
  5. Step 5: Solve for x
    x = 35,482.84/199.12
  6. Step 6: Final answer
    x = 178.20

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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.