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Finding the Fourth Proportional to 29.16, 43.43 and 28.80

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Solution

The fourth proportional to 29.16, 43.43 and 28.80 is: 42.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.16 : 43.43 = 28.80 : x
  2. Step 2: Convert to fraction form
    29.16/43.43 = 28.80/x
  3. Step 3: Cross multiply
    29.16x = 43.43 × 28.80
  4. Step 4: Simplify right side
    29.16x = 1,250.71
  5. Step 5: Solve for x
    x = 1,250.71/29.16
  6. Step 6: Final answer
    x = 42.90

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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.