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Finding the Fourth Proportional to 9.34, 12.90 and 8.19

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Solution

The fourth proportional to 9.34, 12.90 and 8.19 is: 11.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.34 : 12.90 = 8.19 : x
  2. Step 2: Convert to fraction form
    9.34/12.90 = 8.19/x
  3. Step 3: Cross multiply
    9.34x = 12.90 × 8.19
  4. Step 4: Simplify right side
    9.34x = 105.65
  5. Step 5: Solve for x
    x = 105.65/9.34
  6. Step 6: Final answer
    x = 11.31

Related Problems

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Double scale
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1.5x scale

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.