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Finding the Fourth Proportional to 9.47, 14.21 and 8.90

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Solution

The fourth proportional to 9.47, 14.21 and 8.90 is: 13.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.47 : 14.21 = 8.90 : x
  2. Step 2: Convert to fraction form
    9.47/14.21 = 8.90/x
  3. Step 3: Cross multiply
    9.47x = 14.21 × 8.90
  4. Step 4: Simplify right side
    9.47x = 126.47
  5. Step 5: Solve for x
    x = 126.47/9.47
  6. Step 6: Final answer
    x = 13.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.