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Finding the Fourth Proportional to 926.39, 1,388.68 and 309.78

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Solution

The fourth proportional to 926.39, 1,388.68 and 309.78 is: 464.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.39 : 1,388.68 = 309.78 : x
  2. Step 2: Convert to fraction form
    926.39/1,388.68 = 309.78/x
  3. Step 3: Cross multiply
    926.39x = 1,388.68 × 309.78
  4. Step 4: Simplify right side
    926.39x = 430,185.29
  5. Step 5: Solve for x
    x = 430,185.29/926.39
  6. Step 6: Final answer
    x = 464.37

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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.