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Finding the Fourth Proportional to 927.68, 1,391.72 and 278.39

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Solution

The fourth proportional to 927.68, 1,391.72 and 278.39 is: 417.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.68 : 1,391.72 = 278.39 : x
  2. Step 2: Convert to fraction form
    927.68/1,391.72 = 278.39/x
  3. Step 3: Cross multiply
    927.68x = 1,391.72 × 278.39
  4. Step 4: Simplify right side
    927.68x = 387,432.58
  5. Step 5: Solve for x
    x = 387,432.58/927.68
  6. Step 6: Final answer
    x = 417.64

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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.