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Finding the Fourth Proportional to 19.74, 29.47 and 18.86

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Solution

The fourth proportional to 19.74, 29.47 and 18.86 is: 28.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.74 : 29.47 = 18.86 : x
  2. Step 2: Convert to fraction form
    19.74/29.47 = 18.86/x
  3. Step 3: Cross multiply
    19.74x = 29.47 × 18.86
  4. Step 4: Simplify right side
    19.74x = 555.80
  5. Step 5: Solve for x
    x = 555.80/19.74
  6. Step 6: Final answer
    x = 28.16

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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.