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Finding the Fourth Proportional to 21,770.79, 32,670.74 and 7,919.79

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Solution

The fourth proportional to 21,770.79, 32,670.74 and 7,919.79 is: 11,884.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,770.79 : 32,670.74 = 7,919.79 : x
  2. Step 2: Convert to fraction form
    21,770.79/32,670.74 = 7,919.79/x
  3. Step 3: Cross multiply
    21,770.79x = 32,670.74 × 7,919.79
  4. Step 4: Simplify right side
    21,770.79x = 258,745,236.59
  5. Step 5: Solve for x
    x = 258,745,236.59/21,770.79
  6. Step 6: Final answer
    x = 11,884.98

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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.