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Finding the Fourth Proportional to 98.87, 148.38 and 53.21

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Solution

The fourth proportional to 98.87, 148.38 and 53.21 is: 79.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.87 : 148.38 = 53.21 : x
  2. Step 2: Convert to fraction form
    98.87/148.38 = 53.21/x
  3. Step 3: Cross multiply
    98.87x = 148.38 × 53.21
  4. Step 4: Simplify right side
    98.87x = 7,895.30
  5. Step 5: Solve for x
    x = 7,895.30/98.87
  6. Step 6: Final answer
    x = 79.86

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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.