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Finding the Fourth Proportional to 84.90, 126.98 and 75.83

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Solution

The fourth proportional to 84.90, 126.98 and 75.83 is: 113.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.90 : 126.98 = 75.83 : x
  2. Step 2: Convert to fraction form
    84.90/126.98 = 75.83/x
  3. Step 3: Cross multiply
    84.90x = 126.98 × 75.83
  4. Step 4: Simplify right side
    84.90x = 9,627.88
  5. Step 5: Solve for x
    x = 9,627.88/84.90
  6. Step 6: Final answer
    x = 113.40

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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.