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Finding the Fourth Proportional to 14.21, 19.62 and 8.76

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Solution

The fourth proportional to 14.21, 19.62 and 8.76 is: 12.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.21 : 19.62 = 8.76 : x
  2. Step 2: Convert to fraction form
    14.21/19.62 = 8.76/x
  3. Step 3: Cross multiply
    14.21x = 19.62 × 8.76
  4. Step 4: Simplify right side
    14.21x = 171.81
  5. Step 5: Solve for x
    x = 171.81/14.21
  6. Step 6: Final answer
    x = 12.09

Related Problems

Find fourth proportional to 7.10, 9.81 and 4.38
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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.