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Finding the Fourth Proportional to 189.96, 261.90 and 130.74

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Solution

The fourth proportional to 189.96, 261.90 and 130.74 is: 180.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.96 : 261.90 = 130.74 : x
  2. Step 2: Convert to fraction form
    189.96/261.90 = 130.74/x
  3. Step 3: Cross multiply
    189.96x = 261.90 × 130.74
  4. Step 4: Simplify right side
    189.96x = 34,240.81
  5. Step 5: Solve for x
    x = 34,240.81/189.96
  6. Step 6: Final answer
    x = 180.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.