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Finding the Fourth Proportional to 84.64, 126.90 and 50.47

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Solution

The fourth proportional to 84.64, 126.90 and 50.47 is: 75.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.64 : 126.90 = 50.47 : x
  2. Step 2: Convert to fraction form
    84.64/126.90 = 50.47/x
  3. Step 3: Cross multiply
    84.64x = 126.90 × 50.47
  4. Step 4: Simplify right side
    84.64x = 6,404.64
  5. Step 5: Solve for x
    x = 6,404.64/84.64
  6. Step 6: Final answer
    x = 75.67

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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.