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Finding the Fourth Proportional to 10.31, 14.29 and 9.80

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Solution

The fourth proportional to 10.31, 14.29 and 9.80 is: 13.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.31 : 14.29 = 9.80 : x
  2. Step 2: Convert to fraction form
    10.31/14.29 = 9.80/x
  3. Step 3: Cross multiply
    10.31x = 14.29 × 9.80
  4. Step 4: Simplify right side
    10.31x = 139.97
  5. Step 5: Solve for x
    x = 139.97/10.31
  6. Step 6: Final answer
    x = 13.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.