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Finding the Fourth Proportional to 524.80, 787.20 and 319.43

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Solution

The fourth proportional to 524.80, 787.20 and 319.43 is: 479.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    524.80 : 787.20 = 319.43 : x
  2. Step 2: Convert to fraction form
    524.80/787.20 = 319.43/x
  3. Step 3: Cross multiply
    524.80x = 787.20 × 319.43
  4. Step 4: Simplify right side
    524.80x = 251,455.30
  5. Step 5: Solve for x
    x = 251,455.30/524.80
  6. Step 6: Final answer
    x = 479.15

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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.