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Finding the Fourth Proportional to 288.51, 398.03 and 188.90

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Solution

The fourth proportional to 288.51, 398.03 and 188.90 is: 260.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.51 : 398.03 = 188.90 : x
  2. Step 2: Convert to fraction form
    288.51/398.03 = 188.90/x
  3. Step 3: Cross multiply
    288.51x = 398.03 × 188.90
  4. Step 4: Simplify right side
    288.51x = 75,187.87
  5. Step 5: Solve for x
    x = 75,187.87/288.51
  6. Step 6: Final answer
    x = 260.61

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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.