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Finding the Fourth Proportional to 14.22, 19.62 and 7.75

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Solution

The fourth proportional to 14.22, 19.62 and 7.75 is: 10.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.22 : 19.62 = 7.75 : x
  2. Step 2: Convert to fraction form
    14.22/19.62 = 7.75/x
  3. Step 3: Cross multiply
    14.22x = 19.62 × 7.75
  4. Step 4: Simplify right side
    14.22x = 152.07
  5. Step 5: Solve for x
    x = 152.07/14.22
  6. Step 6: Final answer
    x = 10.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.