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Finding the Fourth Proportional to 524.20, 787.40 and 443.20

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Solution

The fourth proportional to 524.20, 787.40 and 443.20 is: 665.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    524.20 : 787.40 = 443.20 : x
  2. Step 2: Convert to fraction form
    524.20/787.40 = 443.20/x
  3. Step 3: Cross multiply
    524.20x = 787.40 × 443.20
  4. Step 4: Simplify right side
    524.20x = 348,975.68
  5. Step 5: Solve for x
    x = 348,975.68/524.20
  6. Step 6: Final answer
    x = 665.73

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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.