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Finding the Fourth Proportional to 523.19, 787.29 and 431.31

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Solution

The fourth proportional to 523.19, 787.29 and 431.31 is: 649.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.19 : 787.29 = 431.31 : x
  2. Step 2: Convert to fraction form
    523.19/787.29 = 431.31/x
  3. Step 3: Cross multiply
    523.19x = 787.29 × 431.31
  4. Step 4: Simplify right side
    523.19x = 339,566.05
  5. Step 5: Solve for x
    x = 339,566.05/523.19
  6. Step 6: Final answer
    x = 649.04

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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.