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Finding the Fourth Proportional to 97.84, 147.43 and 81.10

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Solution

The fourth proportional to 97.84, 147.43 and 81.10 is: 122.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.84 : 147.43 = 81.10 : x
  2. Step 2: Convert to fraction form
    97.84/147.43 = 81.10/x
  3. Step 3: Cross multiply
    97.84x = 147.43 × 81.10
  4. Step 4: Simplify right side
    97.84x = 11,955.84
  5. Step 5: Solve for x
    x = 11,955.84/97.84
  6. Step 6: Final answer
    x = 122.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.