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Finding the Fourth Proportional to 938.06, 1,293.50 and 639.50

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Solution

The fourth proportional to 938.06, 1,293.50 and 639.50 is: 881.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.06 : 1,293.50 = 639.50 : x
  2. Step 2: Convert to fraction form
    938.06/1,293.50 = 639.50/x
  3. Step 3: Cross multiply
    938.06x = 1,293.50 × 639.50
  4. Step 4: Simplify right side
    938.06x = 827,193.25
  5. Step 5: Solve for x
    x = 827,193.25/938.06
  6. Step 6: Final answer
    x = 881.81

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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.