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Finding the Fourth Proportional to 61.91, 92.88 and 39.07

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Solution

The fourth proportional to 61.91, 92.88 and 39.07 is: 58.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.91 : 92.88 = 39.07 : x
  2. Step 2: Convert to fraction form
    61.91/92.88 = 39.07/x
  3. Step 3: Cross multiply
    61.91x = 92.88 × 39.07
  4. Step 4: Simplify right side
    61.91x = 3,628.82
  5. Step 5: Solve for x
    x = 3,628.82/61.91
  6. Step 6: Final answer
    x = 58.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.