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Finding the Fourth Proportional to 927.78, 1,391.67 and 278.43

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Solution

The fourth proportional to 927.78, 1,391.67 and 278.43 is: 417.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.78 : 1,391.67 = 278.43 : x
  2. Step 2: Convert to fraction form
    927.78/1,391.67 = 278.43/x
  3. Step 3: Cross multiply
    927.78x = 1,391.67 × 278.43
  4. Step 4: Simplify right side
    927.78x = 387,482.68
  5. Step 5: Solve for x
    x = 387,482.68/927.78
  6. Step 6: Final answer
    x = 417.65

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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.