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Finding the Fourth Proportional to 21.86, 30.13 and 17.19

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Solution

The fourth proportional to 21.86, 30.13 and 17.19 is: 23.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.86 : 30.13 = 17.19 : x
  2. Step 2: Convert to fraction form
    21.86/30.13 = 17.19/x
  3. Step 3: Cross multiply
    21.86x = 30.13 × 17.19
  4. Step 4: Simplify right side
    21.86x = 517.93
  5. Step 5: Solve for x
    x = 517.93/21.86
  6. Step 6: Final answer
    x = 23.69

Related Problems

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.