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Finding the Fourth Proportional to 21,809.72, 32,719.80 and 7,020.02

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Solution

The fourth proportional to 21,809.72, 32,719.80 and 7,020.02 is: 10,531.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,809.72 : 32,719.80 = 7,020.02 : x
  2. Step 2: Convert to fraction form
    21,809.72/32,719.80 = 7,020.02/x
  3. Step 3: Cross multiply
    21,809.72x = 32,719.80 × 7,020.02
  4. Step 4: Simplify right side
    21,809.72x = 229,693,650.40
  5. Step 5: Solve for x
    x = 229,693,650.40/21,809.72
  6. Step 6: Final answer
    x = 10,531.71

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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.