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Finding the Fourth Proportional to 6,978.89, 9,631.34 and 3,835.11

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Solution

The fourth proportional to 6,978.89, 9,631.34 and 3,835.11 is: 5,292.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,978.89 : 9,631.34 = 3,835.11 : x
  2. Step 2: Convert to fraction form
    6,978.89/9,631.34 = 3,835.11/x
  3. Step 3: Cross multiply
    6,978.89x = 9,631.34 × 3,835.11
  4. Step 4: Simplify right side
    6,978.89x = 36,937,248.35
  5. Step 5: Solve for x
    x = 36,937,248.35/6,978.89
  6. Step 6: Final answer
    x = 5,292.71

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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.