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Finding the Fourth Proportional to 228.60, 342.90 and 136.20

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Solution

The fourth proportional to 228.60, 342.90 and 136.20 is: 204.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.60 : 342.90 = 136.20 : x
  2. Step 2: Convert to fraction form
    228.60/342.90 = 136.20/x
  3. Step 3: Cross multiply
    228.60x = 342.90 × 136.20
  4. Step 4: Simplify right side
    228.60x = 46,702.98
  5. Step 5: Solve for x
    x = 46,702.98/228.60
  6. Step 6: Final answer
    x = 204.30

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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.