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Finding the Fourth Proportional to 15.36, 21.19 and 9.13

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Solution

The fourth proportional to 15.36, 21.19 and 9.13 is: 12.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.36 : 21.19 = 9.13 : x
  2. Step 2: Convert to fraction form
    15.36/21.19 = 9.13/x
  3. Step 3: Cross multiply
    15.36x = 21.19 × 9.13
  4. Step 4: Simplify right side
    15.36x = 193.42
  5. Step 5: Solve for x
    x = 193.42/15.36
  6. Step 6: Final answer
    x = 12.60

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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.