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Finding the Fourth Proportional to 9, 13.50 and 8.45

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Solution

The fourth proportional to 9, 13.50 and 8.45 is: 12.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    9 : 13.50 = 8.45 : x
  2. Step 2: Convert to fraction form
    9/13.50 = 8.45/x
  3. Step 3: Cross multiply
    9x = 13.50 × 8.45
  4. Step 4: Simplify right side
    9x = 114.08
  5. Step 5: Solve for x
    x = 114.08/9
  6. Step 6: Final answer
    x = 12.68

Related Problems

Find fourth proportional to 4.50, 6.75 and 4.23
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Double scale
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Similar ratio
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1.5x scale

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.