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Finding the Fourth Proportional to 21,959, 32,942.66 and 8,812.40

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Solution

The fourth proportional to 21,959, 32,942.66 and 8,812.40 is: 13,220.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959 : 32,942.66 = 8,812.40 : x
  2. Step 2: Convert to fraction form
    21,959/32,942.66 = 8,812.40/x
  3. Step 3: Cross multiply
    21,959x = 32,942.66 × 8,812.40
  4. Step 4: Simplify right side
    21,959x = 290,303,896.98
  5. Step 5: Solve for x
    x = 290,303,896.98/21,959
  6. Step 6: Final answer
    x = 13,220.27

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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.