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Finding the Fourth Proportional to 228.64, 342.90 and 84.40

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Solution

The fourth proportional to 228.64, 342.90 and 84.40 is: 126.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.64 : 342.90 = 84.40 : x
  2. Step 2: Convert to fraction form
    228.64/342.90 = 84.40/x
  3. Step 3: Cross multiply
    228.64x = 342.90 × 84.40
  4. Step 4: Simplify right side
    228.64x = 28,940.76
  5. Step 5: Solve for x
    x = 28,940.76/228.64
  6. Step 6: Final answer
    x = 126.58

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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.