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Finding the Fourth Proportional to 48.19, 66.50 and 28.78

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Solution

The fourth proportional to 48.19, 66.50 and 28.78 is: 39.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.19 : 66.50 = 28.78 : x
  2. Step 2: Convert to fraction form
    48.19/66.50 = 28.78/x
  3. Step 3: Cross multiply
    48.19x = 66.50 × 28.78
  4. Step 4: Simplify right side
    48.19x = 1,913.87
  5. Step 5: Solve for x
    x = 1,913.87/48.19
  6. Step 6: Final answer
    x = 39.72

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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.