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Finding the Fourth Proportional to 228.61, 342.84 and 89.76

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Solution

The fourth proportional to 228.61, 342.84 and 89.76 is: 134.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.61 : 342.84 = 89.76 : x
  2. Step 2: Convert to fraction form
    228.61/342.84 = 89.76/x
  3. Step 3: Cross multiply
    228.61x = 342.84 × 89.76
  4. Step 4: Simplify right side
    228.61x = 30,773.32
  5. Step 5: Solve for x
    x = 30,773.32/228.61
  6. Step 6: Final answer
    x = 134.61

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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.