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Finding the Fourth Proportional to 98.50, 135.61 and 85.56

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Solution

The fourth proportional to 98.50, 135.61 and 85.56 is: 117.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.50 : 135.61 = 85.56 : x
  2. Step 2: Convert to fraction form
    98.50/135.61 = 85.56/x
  3. Step 3: Cross multiply
    98.50x = 135.61 × 85.56
  4. Step 4: Simplify right side
    98.50x = 11,602.07
  5. Step 5: Solve for x
    x = 11,602.07/98.50
  6. Step 6: Final answer
    x = 117.79

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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.