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Finding the Fourth Proportional to 48.46, 72.78 and 30.46

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Solution

The fourth proportional to 48.46, 72.78 and 30.46 is: 45.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.46 : 72.78 = 30.46 : x
  2. Step 2: Convert to fraction form
    48.46/72.78 = 30.46/x
  3. Step 3: Cross multiply
    48.46x = 72.78 × 30.46
  4. Step 4: Simplify right side
    48.46x = 2,216.88
  5. Step 5: Solve for x
    x = 2,216.88/48.46
  6. Step 6: Final answer
    x = 45.75

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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.