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Finding the Fourth Proportional to 13.07, 18 and 11.45

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Solution

The fourth proportional to 13.07, 18 and 11.45 is: 15.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.07 : 18 = 11.45 : x
  2. Step 2: Convert to fraction form
    13.07/18 = 11.45/x
  3. Step 3: Cross multiply
    13.07x = 18 × 11.45
  4. Step 4: Simplify right side
    13.07x = 206.01
  5. Step 5: Solve for x
    x = 206.01/13.07
  6. Step 6: Final answer
    x = 15.77

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1.5x scale

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.