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Finding the Fourth Proportional to 18.76, 25.88 and 13

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Solution

The fourth proportional to 18.76, 25.88 and 13 is: 17.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.76 : 25.88 = 13 : x
  2. Step 2: Convert to fraction form
    18.76/25.88 = 13/x
  3. Step 3: Cross multiply
    18.76x = 25.88 × 13
  4. Step 4: Simplify right side
    18.76x = 336.44
  5. Step 5: Solve for x
    x = 336.44/18.76
  6. Step 6: Final answer
    x = 17.93

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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.