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Finding the Fourth Proportional to 684.71, 1,026.45 and 251.78

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Solution

The fourth proportional to 684.71, 1,026.45 and 251.78 is: 377.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.71 : 1,026.45 = 251.78 : x
  2. Step 2: Convert to fraction form
    684.71/1,026.45 = 251.78/x
  3. Step 3: Cross multiply
    684.71x = 1,026.45 × 251.78
  4. Step 4: Simplify right side
    684.71x = 258,439.58
  5. Step 5: Solve for x
    x = 258,439.58/684.71
  6. Step 6: Final answer
    x = 377.44

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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.