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Finding the Fourth Proportional to 9.74, 14.70 and 9.42

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Solution

The fourth proportional to 9.74, 14.70 and 9.42 is: 14.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.74 : 14.70 = 9.42 : x
  2. Step 2: Convert to fraction form
    9.74/14.70 = 9.42/x
  3. Step 3: Cross multiply
    9.74x = 14.70 × 9.42
  4. Step 4: Simplify right side
    9.74x = 138.47
  5. Step 5: Solve for x
    x = 138.47/9.74
  6. Step 6: Final answer
    x = 14.22

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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.