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Finding the Fourth Proportional to 372.12, 557.12 and 290.72

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Solution

The fourth proportional to 372.12, 557.12 and 290.72 is: 435.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.12 : 557.12 = 290.72 : x
  2. Step 2: Convert to fraction form
    372.12/557.12 = 290.72/x
  3. Step 3: Cross multiply
    372.12x = 557.12 × 290.72
  4. Step 4: Simplify right side
    372.12x = 161,961.69
  5. Step 5: Solve for x
    x = 161,961.69/372.12
  6. Step 6: Final answer
    x = 435.24

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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.