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Finding the Fourth Proportional to 385.92, 578.88 and 203.70

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Solution

The fourth proportional to 385.92, 578.88 and 203.70 is: 305.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.92 : 578.88 = 203.70 : x
  2. Step 2: Convert to fraction form
    385.92/578.88 = 203.70/x
  3. Step 3: Cross multiply
    385.92x = 578.88 × 203.70
  4. Step 4: Simplify right side
    385.92x = 117,917.86
  5. Step 5: Solve for x
    x = 117,917.86/385.92
  6. Step 6: Final answer
    x = 305.55

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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.