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Finding the Fourth Proportional to 98.75, 147.90 and 75.87

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Solution

The fourth proportional to 98.75, 147.90 and 75.87 is: 113.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.75 : 147.90 = 75.87 : x
  2. Step 2: Convert to fraction form
    98.75/147.90 = 75.87/x
  3. Step 3: Cross multiply
    98.75x = 147.90 × 75.87
  4. Step 4: Simplify right side
    98.75x = 11,221.17
  5. Step 5: Solve for x
    x = 11,221.17/98.75
  6. Step 6: Final answer
    x = 113.64

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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.