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Finding the Fourth Proportional to 98.75, 148.19 and 53.13

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Solution

The fourth proportional to 98.75, 148.19 and 53.13 is: 79.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.75 : 148.19 = 53.13 : x
  2. Step 2: Convert to fraction form
    98.75/148.19 = 53.13/x
  3. Step 3: Cross multiply
    98.75x = 148.19 × 53.13
  4. Step 4: Simplify right side
    98.75x = 7,873.33
  5. Step 5: Solve for x
    x = 7,873.33/98.75
  6. Step 6: Final answer
    x = 79.73

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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.