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Finding the Fourth Proportional to 310.74, 428.88 and 177.95

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Solution

The fourth proportional to 310.74, 428.88 and 177.95 is: 245.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.74 : 428.88 = 177.95 : x
  2. Step 2: Convert to fraction form
    310.74/428.88 = 177.95/x
  3. Step 3: Cross multiply
    310.74x = 428.88 × 177.95
  4. Step 4: Simplify right side
    310.74x = 76,319.20
  5. Step 5: Solve for x
    x = 76,319.20/310.74
  6. Step 6: Final answer
    x = 245.60

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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.