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Finding the Fourth Proportional to 9.18, 12.64 and 7.12

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Solution

The fourth proportional to 9.18, 12.64 and 7.12 is: 9.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.18 : 12.64 = 7.12 : x
  2. Step 2: Convert to fraction form
    9.18/12.64 = 7.12/x
  3. Step 3: Cross multiply
    9.18x = 12.64 × 7.12
  4. Step 4: Simplify right side
    9.18x = 90.00
  5. Step 5: Solve for x
    x = 90.00/9.18
  6. Step 6: Final answer
    x = 9.80

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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.