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Finding the Fourth Proportional to 228.46, 342.70 and 89.64

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Solution

The fourth proportional to 228.46, 342.70 and 89.64 is: 134.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.46 : 342.70 = 89.64 : x
  2. Step 2: Convert to fraction form
    228.46/342.70 = 89.64/x
  3. Step 3: Cross multiply
    228.46x = 342.70 × 89.64
  4. Step 4: Simplify right side
    228.46x = 30,717.91
  5. Step 5: Solve for x
    x = 30,717.91/228.46
  6. Step 6: Final answer
    x = 134.46

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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.