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Finding the Fourth Proportional to 189.04, 260.78 and 115.31

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Solution

The fourth proportional to 189.04, 260.78 and 115.31 is: 159.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.04 : 260.78 = 115.31 : x
  2. Step 2: Convert to fraction form
    189.04/260.78 = 115.31/x
  3. Step 3: Cross multiply
    189.04x = 260.78 × 115.31
  4. Step 4: Simplify right side
    189.04x = 30,069.24
  5. Step 5: Solve for x
    x = 30,069.24/189.04
  6. Step 6: Final answer
    x = 159.06

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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.