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Finding the Fourth Proportional to 21,956.60, 32,938.99 and 7,169.72

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Solution

The fourth proportional to 21,956.60, 32,938.99 and 7,169.72 is: 10,755.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,956.60 : 32,938.99 = 7,169.72 : x
  2. Step 2: Convert to fraction form
    21,956.60/32,938.99 = 7,169.72/x
  3. Step 3: Cross multiply
    21,956.60x = 32,938.99 × 7,169.72
  4. Step 4: Simplify right side
    21,956.60x = 236,163,152.76
  5. Step 5: Solve for x
    x = 236,163,152.76/21,956.60
  6. Step 6: Final answer
    x = 10,755.91

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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.