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Finding the Fourth Proportional to 22.15, 30.58 and 15.60

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Solution

The fourth proportional to 22.15, 30.58 and 15.60 is: 21.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.15 : 30.58 = 15.60 : x
  2. Step 2: Convert to fraction form
    22.15/30.58 = 15.60/x
  3. Step 3: Cross multiply
    22.15x = 30.58 × 15.60
  4. Step 4: Simplify right side
    22.15x = 477.12
  5. Step 5: Solve for x
    x = 477.12/22.15
  6. Step 6: Final answer
    x = 21.54

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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.