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Finding the Fourth Proportional to 18,864.80, 28,297.20 and 17,115.20

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Solution

The fourth proportional to 18,864.80, 28,297.20 and 17,115.20 is: 25,672.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,864.80 : 28,297.20 = 17,115.20 : x
  2. Step 2: Convert to fraction form
    18,864.80/28,297.20 = 17,115.20/x
  3. Step 3: Cross multiply
    18,864.80x = 28,297.20 × 17,115.20
  4. Step 4: Simplify right side
    18,864.80x = 484,312,237.44
  5. Step 5: Solve for x
    x = 484,312,237.44/18,864.80
  6. Step 6: Final answer
    x = 25,672.80

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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.