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Finding the Fourth Proportional to 15.32, 21.00 and 15.05

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Solution

The fourth proportional to 15.32, 21.00 and 15.05 is: 20.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.32 : 21.00 = 15.05 : x
  2. Step 2: Convert to fraction form
    15.32/21.00 = 15.05/x
  3. Step 3: Cross multiply
    15.32x = 21.00 × 15.05
  4. Step 4: Simplify right side
    15.32x = 315.87
  5. Step 5: Solve for x
    x = 315.87/15.32
  6. Step 6: Final answer
    x = 20.62

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.