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Finding the Fourth Proportional to 21.07, 29.13 and 18.70

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Solution

The fourth proportional to 21.07, 29.13 and 18.70 is: 25.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.07 : 29.13 = 18.70 : x
  2. Step 2: Convert to fraction form
    21.07/29.13 = 18.70/x
  3. Step 3: Cross multiply
    21.07x = 29.13 × 18.70
  4. Step 4: Simplify right side
    21.07x = 544.73
  5. Step 5: Solve for x
    x = 544.73/21.07
  6. Step 6: Final answer
    x = 25.85

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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.