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Finding the Fourth Proportional to 13,900.64, 20,864.99 and 12,329.64

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Solution

The fourth proportional to 13,900.64, 20,864.99 and 12,329.64 is: 18,506.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,900.64 : 20,864.99 = 12,329.64 : x
  2. Step 2: Convert to fraction form
    13,900.64/20,864.99 = 12,329.64/x
  3. Step 3: Cross multiply
    13,900.64x = 20,864.99 × 12,329.64
  4. Step 4: Simplify right side
    13,900.64x = 257,257,846.13
  5. Step 5: Solve for x
    x = 257,257,846.13/13,900.64
  6. Step 6: Final answer
    x = 18,506.91

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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.