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Finding the Fourth Proportional to 12.50, 18.75 and 3

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Solution

The fourth proportional to 12.50, 18.75 and 3 is: 4.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.50 : 18.75 = 3 : x
  2. Step 2: Convert to fraction form
    12.50/18.75 = 3/x
  3. Step 3: Cross multiply
    12.50x = 18.75 × 3
  4. Step 4: Simplify right side
    12.50x = 56.25
  5. Step 5: Solve for x
    x = 56.25/12.50
  6. Step 6: Final answer
    x = 4.50

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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.