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Finding the Fourth Proportional to 98.80, 148.26 and 55.45

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Solution

The fourth proportional to 98.80, 148.26 and 55.45 is: 83.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.80 : 148.26 = 55.45 : x
  2. Step 2: Convert to fraction form
    98.80/148.26 = 55.45/x
  3. Step 3: Cross multiply
    98.80x = 148.26 × 55.45
  4. Step 4: Simplify right side
    98.80x = 8,220.00
  5. Step 5: Solve for x
    x = 8,220.00/98.80
  6. Step 6: Final answer
    x = 83.20

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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.