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Finding the Fourth Proportional to 14.48, 21.70 and 9.40

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Solution

The fourth proportional to 14.48, 21.70 and 9.40 is: 14.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.48 : 21.70 = 9.40 : x
  2. Step 2: Convert to fraction form
    14.48/21.70 = 9.40/x
  3. Step 3: Cross multiply
    14.48x = 21.70 × 9.40
  4. Step 4: Simplify right side
    14.48x = 203.98
  5. Step 5: Solve for x
    x = 203.98/14.48
  6. Step 6: Final answer
    x = 14.09

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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.