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Finding the Fourth Proportional to 84.63, 116.78 and 45.81

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Solution

The fourth proportional to 84.63, 116.78 and 45.81 is: 63.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.63 : 116.78 = 45.81 : x
  2. Step 2: Convert to fraction form
    84.63/116.78 = 45.81/x
  3. Step 3: Cross multiply
    84.63x = 116.78 × 45.81
  4. Step 4: Simplify right side
    84.63x = 5,350.10
  5. Step 5: Solve for x
    x = 5,350.10/84.63
  6. Step 6: Final answer
    x = 63.22

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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.