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Finding the Fourth Proportional to 288.15, 431.98 and 125.72

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Solution

The fourth proportional to 288.15, 431.98 and 125.72 is: 188.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.15 : 431.98 = 125.72 : x
  2. Step 2: Convert to fraction form
    288.15/431.98 = 125.72/x
  3. Step 3: Cross multiply
    288.15x = 431.98 × 125.72
  4. Step 4: Simplify right side
    288.15x = 54,308.53
  5. Step 5: Solve for x
    x = 54,308.53/288.15
  6. Step 6: Final answer
    x = 188.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.