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Finding the Fourth Proportional to 98.48, 147.80 and 40.75

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Solution

The fourth proportional to 98.48, 147.80 and 40.75 is: 61.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.48 : 147.80 = 40.75 : x
  2. Step 2: Convert to fraction form
    98.48/147.80 = 40.75/x
  3. Step 3: Cross multiply
    98.48x = 147.80 × 40.75
  4. Step 4: Simplify right side
    98.48x = 6,022.58
  5. Step 5: Solve for x
    x = 6,022.58/98.48
  6. Step 6: Final answer
    x = 61.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.