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Finding the Fourth Proportional to 14.55, 21.80 and 9.18

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Solution

The fourth proportional to 14.55, 21.80 and 9.18 is: 13.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.55 : 21.80 = 9.18 : x
  2. Step 2: Convert to fraction form
    14.55/21.80 = 9.18/x
  3. Step 3: Cross multiply
    14.55x = 21.80 × 9.18
  4. Step 4: Simplify right side
    14.55x = 200.08
  5. Step 5: Solve for x
    x = 200.08/14.55
  6. Step 6: Final answer
    x = 13.75

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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.