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Finding the Fourth Proportional to 21,325.80, 31,989.02 and 8,178.92

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Solution

The fourth proportional to 21,325.80, 31,989.02 and 8,178.92 is: 12,268.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,325.80 : 31,989.02 = 8,178.92 : x
  2. Step 2: Convert to fraction form
    21,325.80/31,989.02 = 8,178.92/x
  3. Step 3: Cross multiply
    21,325.80x = 31,989.02 × 8,178.92
  4. Step 4: Simplify right side
    21,325.80x = 261,635,635.46
  5. Step 5: Solve for x
    x = 261,635,635.46/21,325.80
  6. Step 6: Final answer
    x = 12,268.50

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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.