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Finding the Fourth Proportional to 21,807.99, 32,728.53 and 15,979.83

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Solution

The fourth proportional to 21,807.99, 32,728.53 and 15,979.83 is: 23,981.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,807.99 : 32,728.53 = 15,979.83 : x
  2. Step 2: Convert to fraction form
    21,807.99/32,728.53 = 15,979.83/x
  3. Step 3: Cross multiply
    21,807.99x = 32,728.53 × 15,979.83
  4. Step 4: Simplify right side
    21,807.99x = 522,996,345.55
  5. Step 5: Solve for x
    x = 522,996,345.55/21,807.99
  6. Step 6: Final answer
    x = 23,981.87

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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.