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Finding the Fourth Proportional to 372.12, 512.76 and 288.55

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Solution

The fourth proportional to 372.12, 512.76 and 288.55 is: 397.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.12 : 512.76 = 288.55 : x
  2. Step 2: Convert to fraction form
    372.12/512.76 = 288.55/x
  3. Step 3: Cross multiply
    372.12x = 512.76 × 288.55
  4. Step 4: Simplify right side
    372.12x = 147,956.90
  5. Step 5: Solve for x
    x = 147,956.90/372.12
  6. Step 6: Final answer
    x = 397.61

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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.