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Finding the Fourth Proportional to 10.16, 15.31 and 9.74

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Solution

The fourth proportional to 10.16, 15.31 and 9.74 is: 14.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.16 : 15.31 = 9.74 : x
  2. Step 2: Convert to fraction form
    10.16/15.31 = 9.74/x
  3. Step 3: Cross multiply
    10.16x = 15.31 × 9.74
  4. Step 4: Simplify right side
    10.16x = 149.04
  5. Step 5: Solve for x
    x = 149.04/10.16
  6. Step 6: Final answer
    x = 14.68

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.