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Finding the Fourth Proportional to 71.88, 99.22 and 48.60

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Solution

The fourth proportional to 71.88, 99.22 and 48.60 is: 67.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.88 : 99.22 = 48.60 : x
  2. Step 2: Convert to fraction form
    71.88/99.22 = 48.60/x
  3. Step 3: Cross multiply
    71.88x = 99.22 × 48.60
  4. Step 4: Simplify right side
    71.88x = 4,822.09
  5. Step 5: Solve for x
    x = 4,822.09/71.88
  6. Step 6: Final answer
    x = 67.09

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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.