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Finding the Fourth Proportional to 18,431.20, 25,872.80 and 18,431.20

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Solution

The fourth proportional to 18,431.20, 25,872.80 and 18,431.20 is: 25,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,431.20 : 25,872.80 = 18,431.20 : x
  2. Step 2: Convert to fraction form
    18,431.20/25,872.80 = 18,431.20/x
  3. Step 3: Cross multiply
    18,431.20x = 25,872.80 × 18,431.20
  4. Step 4: Simplify right side
    18,431.20x = 476,866,751.36
  5. Step 5: Solve for x
    x = 476,866,751.36/18,431.20
  6. Step 6: Final answer
    x = 25,872.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.