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Finding the Fourth Proportional to 926.10, 1,389.36 and 276.90

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Solution

The fourth proportional to 926.10, 1,389.36 and 276.90 is: 415.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.10 : 1,389.36 = 276.90 : x
  2. Step 2: Convert to fraction form
    926.10/1,389.36 = 276.90/x
  3. Step 3: Cross multiply
    926.10x = 1,389.36 × 276.90
  4. Step 4: Simplify right side
    926.10x = 384,713.78
  5. Step 5: Solve for x
    x = 384,713.78/926.10
  6. Step 6: Final answer
    x = 415.41

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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.