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Finding the Fourth Proportional to 61.67, 92.47 and 21.06

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Solution

The fourth proportional to 61.67, 92.47 and 21.06 is: 31.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.67 : 92.47 = 21.06 : x
  2. Step 2: Convert to fraction form
    61.67/92.47 = 21.06/x
  3. Step 3: Cross multiply
    61.67x = 92.47 × 21.06
  4. Step 4: Simplify right side
    61.67x = 1,947.79
  5. Step 5: Solve for x
    x = 1,947.79/61.67
  6. Step 6: Final answer
    x = 31.59

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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.