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Finding the Fourth Proportional to 427.64, 639.72 and 370.49

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Solution

The fourth proportional to 427.64, 639.72 and 370.49 is: 554.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.64 : 639.72 = 370.49 : x
  2. Step 2: Convert to fraction form
    427.64/639.72 = 370.49/x
  3. Step 3: Cross multiply
    427.64x = 639.72 × 370.49
  4. Step 4: Simplify right side
    427.64x = 237,006.66
  5. Step 5: Solve for x
    x = 237,006.66/427.64
  6. Step 6: Final answer
    x = 554.23

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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.