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Finding the Fourth Proportional to 61.79, 85.16 and 48.65

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Solution

The fourth proportional to 61.79, 85.16 and 48.65 is: 67.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.79 : 85.16 = 48.65 : x
  2. Step 2: Convert to fraction form
    61.79/85.16 = 48.65/x
  3. Step 3: Cross multiply
    61.79x = 85.16 × 48.65
  4. Step 4: Simplify right side
    61.79x = 4,142.36
  5. Step 5: Solve for x
    x = 4,142.36/61.79
  6. Step 6: Final answer
    x = 67.04

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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.