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Finding the Fourth Proportional to 10.55, 14.55 and 6.91

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Solution

The fourth proportional to 10.55, 14.55 and 6.91 is: 9.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.55 : 14.55 = 6.91 : x
  2. Step 2: Convert to fraction form
    10.55/14.55 = 6.91/x
  3. Step 3: Cross multiply
    10.55x = 14.55 × 6.91
  4. Step 4: Simplify right side
    10.55x = 100.54
  5. Step 5: Solve for x
    x = 100.54/10.55
  6. Step 6: Final answer
    x = 9.53

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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.