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Finding the Fourth Proportional to 9.96, 15 and 8.70

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Solution

The fourth proportional to 9.96, 15 and 8.70 is: 13.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.96 : 15 = 8.70 : x
  2. Step 2: Convert to fraction form
    9.96/15 = 8.70/x
  3. Step 3: Cross multiply
    9.96x = 15 × 8.70
  4. Step 4: Simplify right side
    9.96x = 130.50
  5. Step 5: Solve for x
    x = 130.50/9.96
  6. Step 6: Final answer
    x = 13.10

Related Problems

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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 (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.