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Finding the Fourth Proportional to 19.79, 29.70 and 14.45

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Solution

The fourth proportional to 19.79, 29.70 and 14.45 is: 21.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.79 : 29.70 = 14.45 : x
  2. Step 2: Convert to fraction form
    19.79/29.70 = 14.45/x
  3. Step 3: Cross multiply
    19.79x = 29.70 × 14.45
  4. Step 4: Simplify right side
    19.79x = 429.17
  5. Step 5: Solve for x
    x = 429.17/19.79
  6. Step 6: Final answer
    x = 21.69

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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.