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Finding the Fourth Proportional to 189.50, 284.28 and 61.28

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Solution

The fourth proportional to 189.50, 284.28 and 61.28 is: 91.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.50 : 284.28 = 61.28 : x
  2. Step 2: Convert to fraction form
    189.50/284.28 = 61.28/x
  3. Step 3: Cross multiply
    189.50x = 284.28 × 61.28
  4. Step 4: Simplify right side
    189.50x = 17,420.68
  5. Step 5: Solve for x
    x = 17,420.68/189.50
  6. Step 6: Final answer
    x = 91.93

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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.