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Finding the Fourth Proportional to 61.80, 92.64 and 21.19

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Solution

The fourth proportional to 61.80, 92.64 and 21.19 is: 31.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.80 : 92.64 = 21.19 : x
  2. Step 2: Convert to fraction form
    61.80/92.64 = 21.19/x
  3. Step 3: Cross multiply
    61.80x = 92.64 × 21.19
  4. Step 4: Simplify right side
    61.80x = 1,963.04
  5. Step 5: Solve for x
    x = 1,963.04/61.80
  6. Step 6: Final answer
    x = 31.76

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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.