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Finding the Fourth Proportional to 6.20, 9.31 and 3.53

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Solution

The fourth proportional to 6.20, 9.31 and 3.53 is: 5.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.20 : 9.31 = 3.53 : x
  2. Step 2: Convert to fraction form
    6.20/9.31 = 3.53/x
  3. Step 3: Cross multiply
    6.20x = 9.31 × 3.53
  4. Step 4: Simplify right side
    6.20x = 32.86
  5. Step 5: Solve for x
    x = 32.86/6.20
  6. Step 6: Final answer
    x = 5.30

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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.