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Finding the Fourth Proportional to 386.12, 578.04 and 203.12

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Solution

The fourth proportional to 386.12, 578.04 and 203.12 is: 304.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.12 : 578.04 = 203.12 : x
  2. Step 2: Convert to fraction form
    386.12/578.04 = 203.12/x
  3. Step 3: Cross multiply
    386.12x = 578.04 × 203.12
  4. Step 4: Simplify right side
    386.12x = 117,411.48
  5. Step 5: Solve for x
    x = 117,411.48/386.12
  6. Step 6: Final answer
    x = 304.08

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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.