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Finding the Fourth Proportional to 48.70, 72.90 and 45.73

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Solution

The fourth proportional to 48.70, 72.90 and 45.73 is: 68.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.70 : 72.90 = 45.73 : x
  2. Step 2: Convert to fraction form
    48.70/72.90 = 45.73/x
  3. Step 3: Cross multiply
    48.70x = 72.90 × 45.73
  4. Step 4: Simplify right side
    48.70x = 3,333.72
  5. Step 5: Solve for x
    x = 3,333.72/48.70
  6. Step 6: Final answer
    x = 68.45

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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.