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Finding the Fourth Proportional to 98.24, 135.58 and 61.42

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Solution

The fourth proportional to 98.24, 135.58 and 61.42 is: 84.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.24 : 135.58 = 61.42 : x
  2. Step 2: Convert to fraction form
    98.24/135.58 = 61.42/x
  3. Step 3: Cross multiply
    98.24x = 135.58 × 61.42
  4. Step 4: Simplify right side
    98.24x = 8,327.32
  5. Step 5: Solve for x
    x = 8,327.32/98.24
  6. Step 6: Final answer
    x = 84.77

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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.