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Finding the Fourth Proportional to 385.76, 578.40 and 223.20

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Solution

The fourth proportional to 385.76, 578.40 and 223.20 is: 334.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.76 : 578.40 = 223.20 : x
  2. Step 2: Convert to fraction form
    385.76/578.40 = 223.20/x
  3. Step 3: Cross multiply
    385.76x = 578.40 × 223.20
  4. Step 4: Simplify right side
    385.76x = 129,098.88
  5. Step 5: Solve for x
    x = 129,098.88/385.76
  6. Step 6: Final answer
    x = 334.66

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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.