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Finding the Fourth Proportional to 107.82, 160.78 and 99.40

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Solution

The fourth proportional to 107.82, 160.78 and 99.40 is: 148.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.82 : 160.78 = 99.40 : x
  2. Step 2: Convert to fraction form
    107.82/160.78 = 99.40/x
  3. Step 3: Cross multiply
    107.82x = 160.78 × 99.40
  4. Step 4: Simplify right side
    107.82x = 15,981.53
  5. Step 5: Solve for x
    x = 15,981.53/107.82
  6. Step 6: Final answer
    x = 148.22

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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.