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Finding the Fourth Proportional to 926.21, 1,389.39 and 276.94

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Solution

The fourth proportional to 926.21, 1,389.39 and 276.94 is: 415.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.21 : 1,389.39 = 276.94 : x
  2. Step 2: Convert to fraction form
    926.21/1,389.39 = 276.94/x
  3. Step 3: Cross multiply
    926.21x = 1,389.39 × 276.94
  4. Step 4: Simplify right side
    926.21x = 384,770.72
  5. Step 5: Solve for x
    x = 384,770.72/926.21
  6. Step 6: Final answer
    x = 415.42

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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.