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Finding the Fourth Proportional to 372.40, 558.90 and 189.91

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Solution

The fourth proportional to 372.40, 558.90 and 189.91 is: 285.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.40 : 558.90 = 189.91 : x
  2. Step 2: Convert to fraction form
    372.40/558.90 = 189.91/x
  3. Step 3: Cross multiply
    372.40x = 558.90 × 189.91
  4. Step 4: Simplify right side
    372.40x = 106,141.40
  5. Step 5: Solve for x
    x = 106,141.40/372.40
  6. Step 6: Final answer
    x = 285.02

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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.