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Finding the Fourth Proportional to 385.48, 578.20 and 222.84

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Solution

The fourth proportional to 385.48, 578.20 and 222.84 is: 334.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.48 : 578.20 = 222.84 : x
  2. Step 2: Convert to fraction form
    385.48/578.20 = 222.84/x
  3. Step 3: Cross multiply
    385.48x = 578.20 × 222.84
  4. Step 4: Simplify right side
    385.48x = 128,846.09
  5. Step 5: Solve for x
    x = 128,846.09/385.48
  6. Step 6: Final answer
    x = 334.25

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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.