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Finding the Fourth Proportional to 647.38, 971.62 and 355.15

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Solution

The fourth proportional to 647.38, 971.62 and 355.15 is: 533.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.38 : 971.62 = 355.15 : x
  2. Step 2: Convert to fraction form
    647.38/971.62 = 355.15/x
  3. Step 3: Cross multiply
    647.38x = 971.62 × 355.15
  4. Step 4: Simplify right side
    647.38x = 345,067.53
  5. Step 5: Solve for x
    x = 345,067.53/647.38
  6. Step 6: Final answer
    x = 533.02

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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.