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Finding the Fourth Proportional to 84.16, 125.90 and 64.75

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Solution

The fourth proportional to 84.16, 125.90 and 64.75 is: 96.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.16 : 125.90 = 64.75 : x
  2. Step 2: Convert to fraction form
    84.16/125.90 = 64.75/x
  3. Step 3: Cross multiply
    84.16x = 125.90 × 64.75
  4. Step 4: Simplify right side
    84.16x = 8,152.23
  5. Step 5: Solve for x
    x = 8,152.23/84.16
  6. Step 6: Final answer
    x = 96.87

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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.