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Finding the Fourth Proportional to 189.32, 283.60 and 140.72

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Solution

The fourth proportional to 189.32, 283.60 and 140.72 is: 210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.32 : 283.60 = 140.72 : x
  2. Step 2: Convert to fraction form
    189.32/283.60 = 140.72/x
  3. Step 3: Cross multiply
    189.32x = 283.60 × 140.72
  4. Step 4: Simplify right side
    189.32x = 39,908.19
  5. Step 5: Solve for x
    x = 39,908.19/189.32
  6. Step 6: Final answer
    x = 210.80

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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.