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Finding the Fourth Proportional to 13,689.59, 20,521.22 and 5,366.84

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Solution

The fourth proportional to 13,689.59, 20,521.22 and 5,366.84 is: 8,045.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.59 : 20,521.22 = 5,366.84 : x
  2. Step 2: Convert to fraction form
    13,689.59/20,521.22 = 5,366.84/x
  3. Step 3: Cross multiply
    13,689.59x = 20,521.22 × 5,366.84
  4. Step 4: Simplify right side
    13,689.59x = 110,133,974.90
  5. Step 5: Solve for x
    x = 110,133,974.90/13,689.59
  6. Step 6: Final answer
    x = 8,045.09

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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.