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Finding the Fourth Proportional to 61.86, 85.44 and 48.21

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Solution

The fourth proportional to 61.86, 85.44 and 48.21 is: 66.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.86 : 85.44 = 48.21 : x
  2. Step 2: Convert to fraction form
    61.86/85.44 = 48.21/x
  3. Step 3: Cross multiply
    61.86x = 85.44 × 48.21
  4. Step 4: Simplify right side
    61.86x = 4,119.06
  5. Step 5: Solve for x
    x = 4,119.06/61.86
  6. Step 6: Final answer
    x = 66.59

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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.