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Finding the Fourth Proportional to 28,324, 39,060.30 and 20,660.32

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Solution

The fourth proportional to 28,324, 39,060.30 and 20,660.32 is: 28,491.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,324 : 39,060.30 = 20,660.32 : x
  2. Step 2: Convert to fraction form
    28,324/39,060.30 = 20,660.32/x
  3. Step 3: Cross multiply
    28,324x = 39,060.30 × 20,660.32
  4. Step 4: Simplify right side
    28,324x = 806,998,297.30
  5. Step 5: Solve for x
    x = 806,998,297.30/28,324
  6. Step 6: Final answer
    x = 28,491.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.