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Finding the Fourth Proportional to 385.28, 578.07 and 202.55

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Solution

The fourth proportional to 385.28, 578.07 and 202.55 is: 303.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.28 : 578.07 = 202.55 : x
  2. Step 2: Convert to fraction form
    385.28/578.07 = 202.55/x
  3. Step 3: Cross multiply
    385.28x = 578.07 × 202.55
  4. Step 4: Simplify right side
    385.28x = 117,088.08
  5. Step 5: Solve for x
    x = 117,088.08/385.28
  6. Step 6: Final answer
    x = 303.90

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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.