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Finding the Fourth Proportional to 385.22, 578.75 and 355.46

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Solution

The fourth proportional to 385.22, 578.75 and 355.46 is: 534.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.22 : 578.75 = 355.46 : x
  2. Step 2: Convert to fraction form
    385.22/578.75 = 355.46/x
  3. Step 3: Cross multiply
    385.22x = 578.75 × 355.46
  4. Step 4: Simplify right side
    385.22x = 205,717.80
  5. Step 5: Solve for x
    x = 205,717.80/385.22
  6. Step 6: Final answer
    x = 534.02

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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.