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Finding the Fourth Proportional to 558.82, 838.40 and 443.31

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Solution

The fourth proportional to 558.82, 838.40 and 443.31 is: 665.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.82 : 838.40 = 443.31 : x
  2. Step 2: Convert to fraction form
    558.82/838.40 = 443.31/x
  3. Step 3: Cross multiply
    558.82x = 838.40 × 443.31
  4. Step 4: Simplify right side
    558.82x = 371,671.10
  5. Step 5: Solve for x
    x = 371,671.10/558.82
  6. Step 6: Final answer
    x = 665.10

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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.