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Finding the Fourth Proportional to 98.78, 148.05 and 44.60

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Solution

The fourth proportional to 98.78, 148.05 and 44.60 is: 66.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.78 : 148.05 = 44.60 : x
  2. Step 2: Convert to fraction form
    98.78/148.05 = 44.60/x
  3. Step 3: Cross multiply
    98.78x = 148.05 × 44.60
  4. Step 4: Simplify right side
    98.78x = 6,603.03
  5. Step 5: Solve for x
    x = 6,603.03/98.78
  6. Step 6: Final answer
    x = 66.85

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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.