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Finding the Fourth Proportional to 49.90, 74.40 and 48.70

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Solution

The fourth proportional to 49.90, 74.40 and 48.70 is: 72.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.90 : 74.40 = 48.70 : x
  2. Step 2: Convert to fraction form
    49.90/74.40 = 48.70/x
  3. Step 3: Cross multiply
    49.90x = 74.40 × 48.70
  4. Step 4: Simplify right side
    49.90x = 3,623.28
  5. Step 5: Solve for x
    x = 3,623.28/49.90
  6. Step 6: Final answer
    x = 72.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.