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Finding the Fourth Proportional to 386.08, 578.80 and 203.52

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Solution

The fourth proportional to 386.08, 578.80 and 203.52 is: 305.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.08 : 578.80 = 203.52 : x
  2. Step 2: Convert to fraction form
    386.08/578.80 = 203.52/x
  3. Step 3: Cross multiply
    386.08x = 578.80 × 203.52
  4. Step 4: Simplify right side
    386.08x = 117,797.38
  5. Step 5: Solve for x
    x = 117,797.38/386.08
  6. Step 6: Final answer
    x = 305.11

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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.