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Finding the Fourth Proportional to 107.84, 148.61 and 87.86

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Solution

The fourth proportional to 107.84, 148.61 and 87.86 is: 121.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.84 : 148.61 = 87.86 : x
  2. Step 2: Convert to fraction form
    107.84/148.61 = 87.86/x
  3. Step 3: Cross multiply
    107.84x = 148.61 × 87.86
  4. Step 4: Simplify right side
    107.84x = 13,055.69
  5. Step 5: Solve for x
    x = 13,055.69/107.84
  6. Step 6: Final answer
    x = 121.07

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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.