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Finding the Fourth Proportional to 21.68, 29.94 and 18.76

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Solution

The fourth proportional to 21.68, 29.94 and 18.76 is: 25.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.68 : 29.94 = 18.76 : x
  2. Step 2: Convert to fraction form
    21.68/29.94 = 18.76/x
  3. Step 3: Cross multiply
    21.68x = 29.94 × 18.76
  4. Step 4: Simplify right side
    21.68x = 561.67
  5. Step 5: Solve for x
    x = 561.67/21.68
  6. Step 6: Final answer
    x = 25.91

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Find fourth proportional to 10.84, 14.97 and 9.38
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Double scale
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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.