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Finding the Fourth Proportional to 936.43, 1,404.88 and 278.28

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Solution

The fourth proportional to 936.43, 1,404.88 and 278.28 is: 417.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.43 : 1,404.88 = 278.28 : x
  2. Step 2: Convert to fraction form
    936.43/1,404.88 = 278.28/x
  3. Step 3: Cross multiply
    936.43x = 1,404.88 × 278.28
  4. Step 4: Simplify right side
    936.43x = 390,949.31
  5. Step 5: Solve for x
    x = 390,949.31/936.43
  6. Step 6: Final answer
    x = 417.49

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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.