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Finding the Fourth Proportional to 15, 20.78 and 14.63

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Solution

The fourth proportional to 15, 20.78 and 14.63 is: 20.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15 : 20.78 = 14.63 : x
  2. Step 2: Convert to fraction form
    15/20.78 = 14.63/x
  3. Step 3: Cross multiply
    15x = 20.78 × 14.63
  4. Step 4: Simplify right side
    15x = 303.83
  5. Step 5: Solve for x
    x = 303.83/15
  6. Step 6: Final answer
    x = 20.26

Related Problems

Find fourth proportional to 7.50, 10.39 and 7.31
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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 (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.