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Finding the Fourth Proportional to 11.31, 15.62 and 7

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Solution

The fourth proportional to 11.31, 15.62 and 7 is: 9.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.31 : 15.62 = 7 : x
  2. Step 2: Convert to fraction form
    11.31/15.62 = 7/x
  3. Step 3: Cross multiply
    11.31x = 15.62 × 7
  4. Step 4: Simplify right side
    11.31x = 109.34
  5. Step 5: Solve for x
    x = 109.34/11.31
  6. Step 6: Final answer
    x = 9.67

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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.