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Finding the Fourth Proportional to 10.62, 15.91 and 5.55

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Solution

The fourth proportional to 10.62, 15.91 and 5.55 is: 8.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.62 : 15.91 = 5.55 : x
  2. Step 2: Convert to fraction form
    10.62/15.91 = 5.55/x
  3. Step 3: Cross multiply
    10.62x = 15.91 × 5.55
  4. Step 4: Simplify right side
    10.62x = 88.31
  5. Step 5: Solve for x
    x = 88.31/10.62
  6. Step 6: Final answer
    x = 8.31

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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.