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Finding the Fourth Proportional to 21,899.80, 32,857.80 and 7,109.20

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Solution

The fourth proportional to 21,899.80, 32,857.80 and 7,109.20 is: 10,666.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,899.80 : 32,857.80 = 7,109.20 : x
  2. Step 2: Convert to fraction form
    21,899.80/32,857.80 = 7,109.20/x
  3. Step 3: Cross multiply
    21,899.80x = 32,857.80 × 7,109.20
  4. Step 4: Simplify right side
    21,899.80x = 233,592,671.76
  5. Step 5: Solve for x
    x = 233,592,671.76/21,899.80
  6. Step 6: Final answer
    x = 10,666.43

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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.