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Finding the Fourth Proportional to 968.86, 1,337.25 and 636.67

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Solution

The fourth proportional to 968.86, 1,337.25 and 636.67 is: 878.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.86 : 1,337.25 = 636.67 : x
  2. Step 2: Convert to fraction form
    968.86/1,337.25 = 636.67/x
  3. Step 3: Cross multiply
    968.86x = 1,337.25 × 636.67
  4. Step 4: Simplify right side
    968.86x = 851,386.96
  5. Step 5: Solve for x
    x = 851,386.96/968.86
  6. Step 6: Final answer
    x = 878.75

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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.