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Finding the Fourth Proportional to 7.72, 11.57 and 4.86

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Solution

The fourth proportional to 7.72, 11.57 and 4.86 is: 7.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.72 : 11.57 = 4.86 : x
  2. Step 2: Convert to fraction form
    7.72/11.57 = 4.86/x
  3. Step 3: Cross multiply
    7.72x = 11.57 × 4.86
  4. Step 4: Simplify right side
    7.72x = 56.23
  5. Step 5: Solve for x
    x = 56.23/7.72
  6. Step 6: Final answer
    x = 7.28

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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.