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Finding the Fourth Proportional to 439.87, 607.31 and 274.15

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Solution

The fourth proportional to 439.87, 607.31 and 274.15 is: 378.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.87 : 607.31 = 274.15 : x
  2. Step 2: Convert to fraction form
    439.87/607.31 = 274.15/x
  3. Step 3: Cross multiply
    439.87x = 607.31 × 274.15
  4. Step 4: Simplify right side
    439.87x = 166,492.67
  5. Step 5: Solve for x
    x = 166,492.67/439.87
  6. Step 6: Final answer
    x = 378.50

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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.