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Finding the Fourth Proportional to 15.70, 21.67 and 9.14

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Solution

The fourth proportional to 15.70, 21.67 and 9.14 is: 12.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.70 : 21.67 = 9.14 : x
  2. Step 2: Convert to fraction form
    15.70/21.67 = 9.14/x
  3. Step 3: Cross multiply
    15.70x = 21.67 × 9.14
  4. Step 4: Simplify right side
    15.70x = 198.10
  5. Step 5: Solve for x
    x = 198.10/15.70
  6. Step 6: Final answer
    x = 12.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.