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Finding the Fourth Proportional to 638.76, 958.20 and 248.66

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Solution

The fourth proportional to 638.76, 958.20 and 248.66 is: 373.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.76 : 958.20 = 248.66 : x
  2. Step 2: Convert to fraction form
    638.76/958.20 = 248.66/x
  3. Step 3: Cross multiply
    638.76x = 958.20 × 248.66
  4. Step 4: Simplify right side
    638.76x = 238,266.01
  5. Step 5: Solve for x
    x = 238,266.01/638.76
  6. Step 6: Final answer
    x = 373.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.