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Finding the Fourth Proportional to 21,308.80, 31,963.20 and 10,940.80

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Solution

The fourth proportional to 21,308.80, 31,963.20 and 10,940.80 is: 16,411.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,308.80 : 31,963.20 = 10,940.80 : x
  2. Step 2: Convert to fraction form
    21,308.80/31,963.20 = 10,940.80/x
  3. Step 3: Cross multiply
    21,308.80x = 31,963.20 × 10,940.80
  4. Step 4: Simplify right side
    21,308.80x = 349,702,978.56
  5. Step 5: Solve for x
    x = 349,702,978.56/21,308.80
  6. Step 6: Final answer
    x = 16,411.20

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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.