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Finding the Fourth Proportional to 306.42, 422.80 and 175.40

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Solution

The fourth proportional to 306.42, 422.80 and 175.40 is: 242.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.42 : 422.80 = 175.40 : x
  2. Step 2: Convert to fraction form
    306.42/422.80 = 175.40/x
  3. Step 3: Cross multiply
    306.42x = 422.80 × 175.40
  4. Step 4: Simplify right side
    306.42x = 74,159.12
  5. Step 5: Solve for x
    x = 74,159.12/306.42
  6. Step 6: Final answer
    x = 242.02

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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.