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Finding the Fourth Proportional to 10.86, 16.35 and 10.20

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Solution

The fourth proportional to 10.86, 16.35 and 10.20 is: 15.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.86 : 16.35 = 10.20 : x
  2. Step 2: Convert to fraction form
    10.86/16.35 = 10.20/x
  3. Step 3: Cross multiply
    10.86x = 16.35 × 10.20
  4. Step 4: Simplify right side
    10.86x = 166.77
  5. Step 5: Solve for x
    x = 166.77/10.86
  6. Step 6: Final answer
    x = 15.36

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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.