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Finding the Fourth Proportional to 61.09, 84.23 and 48.80

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Solution

The fourth proportional to 61.09, 84.23 and 48.80 is: 67.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.09 : 84.23 = 48.80 : x
  2. Step 2: Convert to fraction form
    61.09/84.23 = 48.80/x
  3. Step 3: Cross multiply
    61.09x = 84.23 × 48.80
  4. Step 4: Simplify right side
    61.09x = 4,109.76
  5. Step 5: Solve for x
    x = 4,109.76/61.09
  6. Step 6: Final answer
    x = 67.28

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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.