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Finding the Fourth Proportional to 61.13, 91.66 and 19.99

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Solution

The fourth proportional to 61.13, 91.66 and 19.99 is: 29.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.13 : 91.66 = 19.99 : x
  2. Step 2: Convert to fraction form
    61.13/91.66 = 19.99/x
  3. Step 3: Cross multiply
    61.13x = 91.66 × 19.99
  4. Step 4: Simplify right side
    61.13x = 1,832.07
  5. Step 5: Solve for x
    x = 1,832.07/61.13
  6. Step 6: Final answer
    x = 29.97

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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.