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Finding the Fourth Proportional to 6.40, 9.59 and 3.72

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Solution

The fourth proportional to 6.40, 9.59 and 3.72 is: 5.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.40 : 9.59 = 3.72 : x
  2. Step 2: Convert to fraction form
    6.40/9.59 = 3.72/x
  3. Step 3: Cross multiply
    6.40x = 9.59 × 3.72
  4. Step 4: Simplify right side
    6.40x = 35.61
  5. Step 5: Solve for x
    x = 35.61/6.40
  6. Step 6: Final answer
    x = 5.56

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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.