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Finding the Fourth Proportional to 15.76, 21.74 and 10.31

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Solution

The fourth proportional to 15.76, 21.74 and 10.31 is: 14.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.76 : 21.74 = 10.31 : x
  2. Step 2: Convert to fraction form
    15.76/21.74 = 10.31/x
  3. Step 3: Cross multiply
    15.76x = 21.74 × 10.31
  4. Step 4: Simplify right side
    15.76x = 224.22
  5. Step 5: Solve for x
    x = 224.22/15.76
  6. Step 6: Final answer
    x = 14.23

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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.