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Finding the Fourth Proportional to 10.98, 15.15 and 6.89

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Solution

The fourth proportional to 10.98, 15.15 and 6.89 is: 9.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.98 : 15.15 = 6.89 : x
  2. Step 2: Convert to fraction form
    10.98/15.15 = 6.89/x
  3. Step 3: Cross multiply
    10.98x = 15.15 × 6.89
  4. Step 4: Simplify right side
    10.98x = 104.31
  5. Step 5: Solve for x
    x = 104.31/10.98
  6. Step 6: Final answer
    x = 9.50

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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.