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Finding the Fourth Proportional to 228.96, 343.20 and 84.72

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Solution

The fourth proportional to 228.96, 343.20 and 84.72 is: 126.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.96 : 343.20 = 84.72 : x
  2. Step 2: Convert to fraction form
    228.96/343.20 = 84.72/x
  3. Step 3: Cross multiply
    228.96x = 343.20 × 84.72
  4. Step 4: Simplify right side
    228.96x = 29,075.90
  5. Step 5: Solve for x
    x = 29,075.90/228.96
  6. Step 6: Final answer
    x = 126.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.