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Finding the Fourth Proportional to 21,940.80, 32,911.20 and 15,259.20

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Solution

The fourth proportional to 21,940.80, 32,911.20 and 15,259.20 is: 22,888.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,940.80 : 32,911.20 = 15,259.20 : x
  2. Step 2: Convert to fraction form
    21,940.80/32,911.20 = 15,259.20/x
  3. Step 3: Cross multiply
    21,940.80x = 32,911.20 × 15,259.20
  4. Step 4: Simplify right side
    21,940.80x = 502,198,583.04
  5. Step 5: Solve for x
    x = 502,198,583.04/21,940.80
  6. Step 6: Final answer
    x = 22,888.80

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1.5x scale

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.