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Finding the Fourth Proportional to 18.72, 25.65 and 18.48

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Solution

The fourth proportional to 18.72, 25.65 and 18.48 is: 25.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.72 : 25.65 = 18.48 : x
  2. Step 2: Convert to fraction form
    18.72/25.65 = 18.48/x
  3. Step 3: Cross multiply
    18.72x = 25.65 × 18.48
  4. Step 4: Simplify right side
    18.72x = 474.01
  5. Step 5: Solve for x
    x = 474.01/18.72
  6. Step 6: Final answer
    x = 25.32

Related Problems

Find fourth proportional to 9.36, 12.83 and 9.24
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Double scale
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Similar ratio
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1.5x scale

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.