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Finding the Fourth Proportional to 10.98, 15.17 and 9.77

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Solution

The fourth proportional to 10.98, 15.17 and 9.77 is: 13.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.98 : 15.17 = 9.77 : x
  2. Step 2: Convert to fraction form
    10.98/15.17 = 9.77/x
  3. Step 3: Cross multiply
    10.98x = 15.17 × 9.77
  4. Step 4: Simplify right side
    10.98x = 148.21
  5. Step 5: Solve for x
    x = 148.21/10.98
  6. Step 6: Final answer
    x = 13.50

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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.