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Finding the Fourth Proportional to 97.80, 135.03 and 61.05

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Solution

The fourth proportional to 97.80, 135.03 and 61.05 is: 84.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.80 : 135.03 = 61.05 : x
  2. Step 2: Convert to fraction form
    97.80/135.03 = 61.05/x
  3. Step 3: Cross multiply
    97.80x = 135.03 × 61.05
  4. Step 4: Simplify right side
    97.80x = 8,243.58
  5. Step 5: Solve for x
    x = 8,243.58/97.80
  6. Step 6: Final answer
    x = 84.29

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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.