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Finding the Fourth Proportional to 61.28, 84.62 and 49.07

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Solution

The fourth proportional to 61.28, 84.62 and 49.07 is: 67.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.28 : 84.62 = 49.07 : x
  2. Step 2: Convert to fraction form
    61.28/84.62 = 49.07/x
  3. Step 3: Cross multiply
    61.28x = 84.62 × 49.07
  4. Step 4: Simplify right side
    61.28x = 4,152.27
  5. Step 5: Solve for x
    x = 4,152.27/61.28
  6. Step 6: Final answer
    x = 67.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.