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Finding the Fourth Proportional to 98.78, 148.09 and 50.00

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Solution

The fourth proportional to 98.78, 148.09 and 50.00 is: 74.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.78 : 148.09 = 50.00 : x
  2. Step 2: Convert to fraction form
    98.78/148.09 = 50.00/x
  3. Step 3: Cross multiply
    98.78x = 148.09 × 50.00
  4. Step 4: Simplify right side
    98.78x = 7,404.75
  5. Step 5: Solve for x
    x = 7,404.75/98.78
  6. Step 6: Final answer
    x = 74.96

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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.