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Finding the Fourth Proportional to 926.57, 1,389.72 and 349.31

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Solution

The fourth proportional to 926.57, 1,389.72 and 349.31 is: 523.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.57 : 1,389.72 = 349.31 : x
  2. Step 2: Convert to fraction form
    926.57/1,389.72 = 349.31/x
  3. Step 3: Cross multiply
    926.57x = 1,389.72 × 349.31
  4. Step 4: Simplify right side
    926.57x = 485,447.88
  5. Step 5: Solve for x
    x = 485,447.88/926.57
  6. Step 6: Final answer
    x = 523.92

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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.