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Finding the Fourth Proportional to 9.47, 14.22 and 5.20

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Solution

The fourth proportional to 9.47, 14.22 and 5.20 is: 7.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.47 : 14.22 = 5.20 : x
  2. Step 2: Convert to fraction form
    9.47/14.22 = 5.20/x
  3. Step 3: Cross multiply
    9.47x = 14.22 × 5.20
  4. Step 4: Simplify right side
    9.47x = 73.90
  5. Step 5: Solve for x
    x = 73.90/9.47
  6. Step 6: Final answer
    x = 7.80

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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.