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Finding the Fourth Proportional to 9.47, 14.15 and 7.21

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Solution

The fourth proportional to 9.47, 14.15 and 7.21 is: 10.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.47 : 14.15 = 7.21 : x
  2. Step 2: Convert to fraction form
    9.47/14.15 = 7.21/x
  3. Step 3: Cross multiply
    9.47x = 14.15 × 7.21
  4. Step 4: Simplify right side
    9.47x = 102.02
  5. Step 5: Solve for x
    x = 102.02/9.47
  6. Step 6: Final answer
    x = 10.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.