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Finding the Fourth Proportional to 19.59, 29.40 and 13.59

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Solution

The fourth proportional to 19.59, 29.40 and 13.59 is: 20.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.59 : 29.40 = 13.59 : x
  2. Step 2: Convert to fraction form
    19.59/29.40 = 13.59/x
  3. Step 3: Cross multiply
    19.59x = 29.40 × 13.59
  4. Step 4: Simplify right side
    19.59x = 399.55
  5. Step 5: Solve for x
    x = 399.55/19.59
  6. Step 6: Final answer
    x = 20.40

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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.