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Finding the Fourth Proportional to 310.91, 426.93 and 278.15

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Solution

The fourth proportional to 310.91, 426.93 and 278.15 is: 381.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.91 : 426.93 = 278.15 : x
  2. Step 2: Convert to fraction form
    310.91/426.93 = 278.15/x
  3. Step 3: Cross multiply
    310.91x = 426.93 × 278.15
  4. Step 4: Simplify right side
    310.91x = 118,750.58
  5. Step 5: Solve for x
    x = 118,750.58/310.91
  6. Step 6: Final answer
    x = 381.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.