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Finding the Fourth Proportional to 61.86, 85.28 and 48.69

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Solution

The fourth proportional to 61.86, 85.28 and 48.69 is: 67.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.86 : 85.28 = 48.69 : x
  2. Step 2: Convert to fraction form
    61.86/85.28 = 48.69/x
  3. Step 3: Cross multiply
    61.86x = 85.28 × 48.69
  4. Step 4: Simplify right side
    61.86x = 4,152.72
  5. Step 5: Solve for x
    x = 4,152.72/61.86
  6. Step 6: Final answer
    x = 67.13

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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.