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Finding the Fourth Proportional to 431.43, 647.54 and 287.25

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Solution

The fourth proportional to 431.43, 647.54 and 287.25 is: 431.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.43 : 647.54 = 287.25 : x
  2. Step 2: Convert to fraction form
    431.43/647.54 = 287.25/x
  3. Step 3: Cross multiply
    431.43x = 647.54 × 287.25
  4. Step 4: Simplify right side
    431.43x = 186,002.63
  5. Step 5: Solve for x
    x = 186,002.63/431.43
  6. Step 6: Final answer
    x = 431.14

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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.