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Finding the Fourth Proportional to 7.61, 10.55 and 7.12

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Solution

The fourth proportional to 7.61, 10.55 and 7.12 is: 9.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.61 : 10.55 = 7.12 : x
  2. Step 2: Convert to fraction form
    7.61/10.55 = 7.12/x
  3. Step 3: Cross multiply
    7.61x = 10.55 × 7.12
  4. Step 4: Simplify right side
    7.61x = 75.06
  5. Step 5: Solve for x
    x = 75.06/7.61
  6. Step 6: Final answer
    x = 9.86

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.