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Finding the Fourth Proportional to 285.64, 394.95 and 272.50

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Solution

The fourth proportional to 285.64, 394.95 and 272.50 is: 376.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.64 : 394.95 = 272.50 : x
  2. Step 2: Convert to fraction form
    285.64/394.95 = 272.50/x
  3. Step 3: Cross multiply
    285.64x = 394.95 × 272.50
  4. Step 4: Simplify right side
    285.64x = 107,623.88
  5. Step 5: Solve for x
    x = 107,623.88/285.64
  6. Step 6: Final answer
    x = 376.78

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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.