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Finding the Fourth Proportional to 921.52, 1,379 and 906.96

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Solution

The fourth proportional to 921.52, 1,379 and 906.96 is: 1,357.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.52 : 1,379 = 906.96 : x
  2. Step 2: Convert to fraction form
    921.52/1,379 = 906.96/x
  3. Step 3: Cross multiply
    921.52x = 1,379 × 906.96
  4. Step 4: Simplify right side
    921.52x = 1,250,697.84
  5. Step 5: Solve for x
    x = 1,250,697.84/921.52
  6. Step 6: Final answer
    x = 1,357.21

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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.