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Finding the Fourth Proportional to 30.73, 42.36 and 28.69

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Solution

The fourth proportional to 30.73, 42.36 and 28.69 is: 39.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.73 : 42.36 = 28.69 : x
  2. Step 2: Convert to fraction form
    30.73/42.36 = 28.69/x
  3. Step 3: Cross multiply
    30.73x = 42.36 × 28.69
  4. Step 4: Simplify right side
    30.73x = 1,215.31
  5. Step 5: Solve for x
    x = 1,215.31/30.73
  6. Step 6: Final answer
    x = 39.55

Related Problems

Find fourth proportional to 15.37, 21.18 and 14.35
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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.