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Finding the Fourth Proportional to 98.50, 135.91 and 57.06

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Solution

The fourth proportional to 98.50, 135.91 and 57.06 is: 78.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.50 : 135.91 = 57.06 : x
  2. Step 2: Convert to fraction form
    98.50/135.91 = 57.06/x
  3. Step 3: Cross multiply
    98.50x = 135.91 × 57.06
  4. Step 4: Simplify right side
    98.50x = 7,755.10
  5. Step 5: Solve for x
    x = 7,755.10/98.50
  6. Step 6: Final answer
    x = 78.73

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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.