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Finding the Fourth Proportional to 304.31, 420.15 and 200.87

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Solution

The fourth proportional to 304.31, 420.15 and 200.87 is: 277.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.31 : 420.15 = 200.87 : x
  2. Step 2: Convert to fraction form
    304.31/420.15 = 200.87/x
  3. Step 3: Cross multiply
    304.31x = 420.15 × 200.87
  4. Step 4: Simplify right side
    304.31x = 84,395.53
  5. Step 5: Solve for x
    x = 84,395.53/304.31
  6. Step 6: Final answer
    x = 277.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.