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Finding the Fourth Proportional to 189.68, 284.12 and 155.28

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Solution

The fourth proportional to 189.68, 284.12 and 155.28 is: 232.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.68 : 284.12 = 155.28 : x
  2. Step 2: Convert to fraction form
    189.68/284.12 = 155.28/x
  3. Step 3: Cross multiply
    189.68x = 284.12 × 155.28
  4. Step 4: Simplify right side
    189.68x = 44,118.15
  5. Step 5: Solve for x
    x = 44,118.15/189.68
  6. Step 6: Final answer
    x = 232.59

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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.