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Finding the Fourth Proportional to 49.80, 68.70 and 40.65

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Solution

The fourth proportional to 49.80, 68.70 and 40.65 is: 56.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.80 : 68.70 = 40.65 : x
  2. Step 2: Convert to fraction form
    49.80/68.70 = 40.65/x
  3. Step 3: Cross multiply
    49.80x = 68.70 × 40.65
  4. Step 4: Simplify right side
    49.80x = 2,792.66
  5. Step 5: Solve for x
    x = 2,792.66/49.80
  6. Step 6: Final answer
    x = 56.08

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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.