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Finding the Fourth Proportional to 48.45, 72.57 and 39.80

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Solution

The fourth proportional to 48.45, 72.57 and 39.80 is: 59.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.45 : 72.57 = 39.80 : x
  2. Step 2: Convert to fraction form
    48.45/72.57 = 39.80/x
  3. Step 3: Cross multiply
    48.45x = 72.57 × 39.80
  4. Step 4: Simplify right side
    48.45x = 2,888.10
  5. Step 5: Solve for x
    x = 2,888.10/48.45
  6. Step 6: Final answer
    x = 59.61

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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.