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Finding the Fourth Proportional to 18, 26.86 and 17.74

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Solution

The fourth proportional to 18, 26.86 and 17.74 is: 26.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18 : 26.86 = 17.74 : x
  2. Step 2: Convert to fraction form
    18/26.86 = 17.74/x
  3. Step 3: Cross multiply
    18x = 26.86 × 17.74
  4. Step 4: Simplify right side
    18x = 476.50
  5. Step 5: Solve for x
    x = 476.50/18
  6. Step 6: Final answer
    x = 26.47

Related Problems

Find fourth proportional to 9, 13.43 and 8.87
Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

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