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Finding the Fourth Proportional to 189.24, 258.90 and 188.70

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Solution

The fourth proportional to 189.24, 258.90 and 188.70 is: 258.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.24 : 258.90 = 188.70 : x
  2. Step 2: Convert to fraction form
    189.24/258.90 = 188.70/x
  3. Step 3: Cross multiply
    189.24x = 258.90 × 188.70
  4. Step 4: Simplify right side
    189.24x = 48,854.43
  5. Step 5: Solve for x
    x = 48,854.43/189.24
  6. Step 6: Final answer
    x = 258.16

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.