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Finding the Fourth Proportional to 20.70, 31.02 and 10.56

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Solution

The fourth proportional to 20.70, 31.02 and 10.56 is: 15.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.70 : 31.02 = 10.56 : x
  2. Step 2: Convert to fraction form
    20.70/31.02 = 10.56/x
  3. Step 3: Cross multiply
    20.70x = 31.02 × 10.56
  4. Step 4: Simplify right side
    20.70x = 327.57
  5. Step 5: Solve for x
    x = 327.57/20.70
  6. Step 6: Final answer
    x = 15.82

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.