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Finding the Third Proportional to 4.78 and 7.50

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Solution

The third proportional to 4.78 and 7.50 is: 11.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.78 : 7.50 = 7.50 : x
  2. Step 2: Convert to fraction form
    4.78/7.50 = 7.50/x
  3. Step 3: Cross multiply
    4.78x = 7.50 × 7.50
  4. Step 4: Simplify right side
    4.78x = 56.25
  5. Step 5: Solve for x
    x = 56.25/4.78
  6. Step 6: Final answer
    x = 11.76

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.