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Finding the Fourth Proportional to 21,960.42, 32,940.70 and 5,320.42

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Solution

The fourth proportional to 21,960.42, 32,940.70 and 5,320.42 is: 7,980.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,960.42 : 32,940.70 = 5,320.42 : x
  2. Step 2: Convert to fraction form
    21,960.42/32,940.70 = 5,320.42/x
  3. Step 3: Cross multiply
    21,960.42x = 32,940.70 × 5,320.42
  4. Step 4: Simplify right side
    21,960.42x = 175,258,359.09
  5. Step 5: Solve for x
    x = 175,258,359.09/21,960.42
  6. Step 6: Final answer
    x = 7,980.65

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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.