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Finding the Fourth Proportional to 684.40, 1,026.78 and 251.56

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Solution

The fourth proportional to 684.40, 1,026.78 and 251.56 is: 377.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.40 : 1,026.78 = 251.56 : x
  2. Step 2: Convert to fraction form
    684.40/1,026.78 = 251.56/x
  3. Step 3: Cross multiply
    684.40x = 1,026.78 × 251.56
  4. Step 4: Simplify right side
    684.40x = 258,296.78
  5. Step 5: Solve for x
    x = 258,296.78/684.40
  6. Step 6: Final answer
    x = 377.41

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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.