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Finding the Fourth Proportional to 15.66, 21.56 and 14.76

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Solution

The fourth proportional to 15.66, 21.56 and 14.76 is: 20.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.66 : 21.56 = 14.76 : x
  2. Step 2: Convert to fraction form
    15.66/21.56 = 14.76/x
  3. Step 3: Cross multiply
    15.66x = 21.56 × 14.76
  4. Step 4: Simplify right side
    15.66x = 318.23
  5. Step 5: Solve for x
    x = 318.23/15.66
  6. Step 6: Final answer
    x = 20.32

Related Problems

Find fourth proportional to 7.83, 10.78 and 7.38
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Double scale
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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.