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Finding the Fourth Proportional to 578.30, 865.71 and 372.15

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Solution

The fourth proportional to 578.30, 865.71 and 372.15 is: 557.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.30 : 865.71 = 372.15 : x
  2. Step 2: Convert to fraction form
    578.30/865.71 = 372.15/x
  3. Step 3: Cross multiply
    578.30x = 865.71 × 372.15
  4. Step 4: Simplify right side
    578.30x = 322,173.98
  5. Step 5: Solve for x
    x = 322,173.98/578.30
  6. Step 6: Final answer
    x = 557.11

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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.