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Finding the Fourth Proportional to 97.84, 135.35 and 86.35

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Solution

The fourth proportional to 97.84, 135.35 and 86.35 is: 119.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.84 : 135.35 = 86.35 : x
  2. Step 2: Convert to fraction form
    97.84/135.35 = 86.35/x
  3. Step 3: Cross multiply
    97.84x = 135.35 × 86.35
  4. Step 4: Simplify right side
    97.84x = 11,687.04
  5. Step 5: Solve for x
    x = 11,687.04/97.84
  6. Step 6: Final answer
    x = 119.45

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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.