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Finding the Fourth Proportional to 28.76, 39.62 and 28.69

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Solution

The fourth proportional to 28.76, 39.62 and 28.69 is: 39.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.76 : 39.62 = 28.69 : x
  2. Step 2: Convert to fraction form
    28.76/39.62 = 28.69/x
  3. Step 3: Cross multiply
    28.76x = 39.62 × 28.69
  4. Step 4: Simplify right side
    28.76x = 1,136.67
  5. Step 5: Solve for x
    x = 1,136.67/28.76
  6. Step 6: Final answer
    x = 39.53

Related Problems

Find fourth proportional to 14.38, 19.81 and 14.34
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.