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Finding the Fourth Proportional to 9.19, 12.64 and 7.98

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Solution

The fourth proportional to 9.19, 12.64 and 7.98 is: 10.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.19 : 12.64 = 7.98 : x
  2. Step 2: Convert to fraction form
    9.19/12.64 = 7.98/x
  3. Step 3: Cross multiply
    9.19x = 12.64 × 7.98
  4. Step 4: Simplify right side
    9.19x = 100.87
  5. Step 5: Solve for x
    x = 100.87/9.19
  6. Step 6: Final answer
    x = 10.98

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.