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Finding the Fourth Proportional to 98.55, 135.98 and 59.20

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Solution

The fourth proportional to 98.55, 135.98 and 59.20 is: 81.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.55 : 135.98 = 59.20 : x
  2. Step 2: Convert to fraction form
    98.55/135.98 = 59.20/x
  3. Step 3: Cross multiply
    98.55x = 135.98 × 59.20
  4. Step 4: Simplify right side
    98.55x = 8,049.82
  5. Step 5: Solve for x
    x = 8,049.82/98.55
  6. Step 6: Final answer
    x = 81.68

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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.