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Finding the Fourth Proportional to 1.08, 1.61 and 0.86

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Solution

The fourth proportional to 1.08, 1.61 and 0.86 is: 1.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.08 : 1.61 = 0.86 : x
  2. Step 2: Convert to fraction form
    1.08/1.61 = 0.86/x
  3. Step 3: Cross multiply
    1.08x = 1.61 × 0.86
  4. Step 4: Simplify right side
    1.08x = 1.38
  5. Step 5: Solve for x
    x = 1.38/1.08
  6. Step 6: Final answer
    x = 1.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.