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Finding the Fourth Proportional to 61.70, 92.54 and 21.11

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Solution

The fourth proportional to 61.70, 92.54 and 21.11 is: 31.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.70 : 92.54 = 21.11 : x
  2. Step 2: Convert to fraction form
    61.70/92.54 = 21.11/x
  3. Step 3: Cross multiply
    61.70x = 92.54 × 21.11
  4. Step 4: Simplify right side
    61.70x = 1,953.65
  5. Step 5: Solve for x
    x = 1,953.65/61.70
  6. Step 6: Final answer
    x = 31.66

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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.