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Finding the Fourth Proportional to 10.16, 14 and 7.86

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Solution

The fourth proportional to 10.16, 14 and 7.86 is: 10.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.16 : 14 = 7.86 : x
  2. Step 2: Convert to fraction form
    10.16/14 = 7.86/x
  3. Step 3: Cross multiply
    10.16x = 14 × 7.86
  4. Step 4: Simplify right side
    10.16x = 110.04
  5. Step 5: Solve for x
    x = 110.04/10.16
  6. Step 6: Final answer
    x = 10.83

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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.