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Finding the Fourth Proportional to 71.63, 98.86 and 49.81

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Solution

The fourth proportional to 71.63, 98.86 and 49.81 is: 68.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.63 : 98.86 = 49.81 : x
  2. Step 2: Convert to fraction form
    71.63/98.86 = 49.81/x
  3. Step 3: Cross multiply
    71.63x = 98.86 × 49.81
  4. Step 4: Simplify right side
    71.63x = 4,924.22
  5. Step 5: Solve for x
    x = 4,924.22/71.63
  6. Step 6: Final answer
    x = 68.75

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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.