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Finding the Fourth Proportional to 14.29, 21.42 and 5.72

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Solution

The fourth proportional to 14.29, 21.42 and 5.72 is: 8.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.29 : 21.42 = 5.72 : x
  2. Step 2: Convert to fraction form
    14.29/21.42 = 5.72/x
  3. Step 3: Cross multiply
    14.29x = 21.42 × 5.72
  4. Step 4: Simplify right side
    14.29x = 122.40
  5. Step 5: Solve for x
    x = 122.40/14.29
  6. Step 6: Final answer
    x = 8.57

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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.