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Finding the Fourth Proportional to 189.90, 263.16 and 187.65

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Solution

The fourth proportional to 189.90, 263.16 and 187.65 is: 260.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.90 : 263.16 = 187.65 : x
  2. Step 2: Convert to fraction form
    189.90/263.16 = 187.65/x
  3. Step 3: Cross multiply
    189.90x = 263.16 × 187.65
  4. Step 4: Simplify right side
    189.90x = 49,381.97
  5. Step 5: Solve for x
    x = 49,381.97/189.90
  6. Step 6: Final answer
    x = 260.04

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.