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Finding the Fourth Proportional to 107.19, 147.96 and 65.81

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Solution

The fourth proportional to 107.19, 147.96 and 65.81 is: 90.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.19 : 147.96 = 65.81 : x
  2. Step 2: Convert to fraction form
    107.19/147.96 = 65.81/x
  3. Step 3: Cross multiply
    107.19x = 147.96 × 65.81
  4. Step 4: Simplify right side
    107.19x = 9,737.62
  5. Step 5: Solve for x
    x = 9,737.62/107.19
  6. Step 6: Final answer
    x = 90.84

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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.