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Finding the Fourth Proportional to 45.78, 63.20 and 28.30

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Solution

The fourth proportional to 45.78, 63.20 and 28.30 is: 39.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.78 : 63.20 = 28.30 : x
  2. Step 2: Convert to fraction form
    45.78/63.20 = 28.30/x
  3. Step 3: Cross multiply
    45.78x = 63.20 × 28.30
  4. Step 4: Simplify right side
    45.78x = 1,788.10
  5. Step 5: Solve for x
    x = 1,788.10/45.78
  6. Step 6: Final answer
    x = 39.06

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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.