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Finding the Fourth Proportional to 19.66, 29.50 and 18.64

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Solution

The fourth proportional to 19.66, 29.50 and 18.64 is: 27.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.66 : 29.50 = 18.64 : x
  2. Step 2: Convert to fraction form
    19.66/29.50 = 18.64/x
  3. Step 3: Cross multiply
    19.66x = 29.50 × 18.64
  4. Step 4: Simplify right side
    19.66x = 549.88
  5. Step 5: Solve for x
    x = 549.88/19.66
  6. Step 6: Final answer
    x = 27.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.