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Finding the Fourth Proportional to 675.66, 936.67 and 638.71

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Solution

The fourth proportional to 675.66, 936.67 and 638.71 is: 885.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.66 : 936.67 = 638.71 : x
  2. Step 2: Convert to fraction form
    675.66/936.67 = 638.71/x
  3. Step 3: Cross multiply
    675.66x = 936.67 × 638.71
  4. Step 4: Simplify right side
    675.66x = 598,260.50
  5. Step 5: Solve for x
    x = 598,260.50/675.66
  6. Step 6: Final answer
    x = 885.45

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.