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Finding the Fourth Proportional to 18,515.54, 25,529.23 and 12,855.16

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Solution

The fourth proportional to 18,515.54, 25,529.23 and 12,855.16 is: 17,724.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,515.54 : 25,529.23 = 12,855.16 : x
  2. Step 2: Convert to fraction form
    18,515.54/25,529.23 = 12,855.16/x
  3. Step 3: Cross multiply
    18,515.54x = 25,529.23 × 12,855.16
  4. Step 4: Simplify right side
    18,515.54x = 328,182,144.40
  5. Step 5: Solve for x
    x = 328,182,144.40/18,515.54
  6. Step 6: Final answer
    x = 17,724.69

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1.5x scale

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.