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Finding the Fourth Proportional to 189.08, 260.92 and 115.40

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Solution

The fourth proportional to 189.08, 260.92 and 115.40 is: 159.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.08 : 260.92 = 115.40 : x
  2. Step 2: Convert to fraction form
    189.08/260.92 = 115.40/x
  3. Step 3: Cross multiply
    189.08x = 260.92 × 115.40
  4. Step 4: Simplify right side
    189.08x = 30,110.17
  5. Step 5: Solve for x
    x = 30,110.17/189.08
  6. Step 6: Final answer
    x = 159.25

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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.