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Finding the Fourth Proportional to 30.80, 46 and 28.96

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Solution

The fourth proportional to 30.80, 46 and 28.96 is: 43.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.80 : 46 = 28.96 : x
  2. Step 2: Convert to fraction form
    30.80/46 = 28.96/x
  3. Step 3: Cross multiply
    30.80x = 46 × 28.96
  4. Step 4: Simplify right side
    30.80x = 1,332.16
  5. Step 5: Solve for x
    x = 1,332.16/30.80
  6. Step 6: Final answer
    x = 43.25

Related Problems

Find fourth proportional to 15.40, 23 and 14.48
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.