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Finding the Fourth Proportional to 19.89, 29.80 and 16.70

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Solution

The fourth proportional to 19.89, 29.80 and 16.70 is: 25.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.89 : 29.80 = 16.70 : x
  2. Step 2: Convert to fraction form
    19.89/29.80 = 16.70/x
  3. Step 3: Cross multiply
    19.89x = 29.80 × 16.70
  4. Step 4: Simplify right side
    19.89x = 497.84
  5. Step 5: Solve for x
    x = 497.84/19.89
  6. Step 6: Final answer
    x = 25.03

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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.