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Finding the Fourth Proportional to 19.79, 29.57 and 14.32

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Solution

The fourth proportional to 19.79, 29.57 and 14.32 is: 21.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.79 : 29.57 = 14.32 : x
  2. Step 2: Convert to fraction form
    19.79/29.57 = 14.32/x
  3. Step 3: Cross multiply
    19.79x = 29.57 × 14.32
  4. Step 4: Simplify right side
    19.79x = 423.48
  5. Step 5: Solve for x
    x = 423.48/19.79
  6. Step 6: Final answer
    x = 21.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.