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Finding the Fourth Proportional to 61.39, 84.59 and 45.86

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Solution

The fourth proportional to 61.39, 84.59 and 45.86 is: 63.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.39 : 84.59 = 45.86 : x
  2. Step 2: Convert to fraction form
    61.39/84.59 = 45.86/x
  3. Step 3: Cross multiply
    61.39x = 84.59 × 45.86
  4. Step 4: Simplify right side
    61.39x = 3,879.30
  5. Step 5: Solve for x
    x = 3,879.30/61.39
  6. Step 6: Final answer
    x = 63.20

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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.