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Finding the Fourth Proportional to 390.25, 580.94 and 372.55

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Solution

The fourth proportional to 390.25, 580.94 and 372.55 is: 554.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.25 : 580.94 = 372.55 : x
  2. Step 2: Convert to fraction form
    390.25/580.94 = 372.55/x
  3. Step 3: Cross multiply
    390.25x = 580.94 × 372.55
  4. Step 4: Simplify right side
    390.25x = 216,429.20
  5. Step 5: Solve for x
    x = 216,429.20/390.25
  6. Step 6: Final answer
    x = 554.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.