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Finding the Fourth Proportional to 439.79, 607.38 and 274.40

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Solution

The fourth proportional to 439.79, 607.38 and 274.40 is: 378.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.79 : 607.38 = 274.40 : x
  2. Step 2: Convert to fraction form
    439.79/607.38 = 274.40/x
  3. Step 3: Cross multiply
    439.79x = 607.38 × 274.40
  4. Step 4: Simplify right side
    439.79x = 166,665.07
  5. Step 5: Solve for x
    x = 166,665.07/439.79
  6. Step 6: Final answer
    x = 378.97

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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.