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Finding the Fourth Proportional to 28.59, 39.46 and 15.66

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Solution

The fourth proportional to 28.59, 39.46 and 15.66 is: 21.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.59 : 39.46 = 15.66 : x
  2. Step 2: Convert to fraction form
    28.59/39.46 = 15.66/x
  3. Step 3: Cross multiply
    28.59x = 39.46 × 15.66
  4. Step 4: Simplify right side
    28.59x = 617.79
  5. Step 5: Solve for x
    x = 617.79/28.59
  6. Step 6: Final answer
    x = 21.61

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.