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Finding the Fourth Proportional to 107.84, 148.76 and 85.70

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Solution

The fourth proportional to 107.84, 148.76 and 85.70 is: 118.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.84 : 148.76 = 85.70 : x
  2. Step 2: Convert to fraction form
    107.84/148.76 = 85.70/x
  3. Step 3: Cross multiply
    107.84x = 148.76 × 85.70
  4. Step 4: Simplify right side
    107.84x = 12,748.73
  5. Step 5: Solve for x
    x = 12,748.73/107.84
  6. Step 6: Final answer
    x = 118.22

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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.