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Finding the Fourth Proportional to 921.47, 1,381.99 and 263.33

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Solution

The fourth proportional to 921.47, 1,381.99 and 263.33 is: 394.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.47 : 1,381.99 = 263.33 : x
  2. Step 2: Convert to fraction form
    921.47/1,381.99 = 263.33/x
  3. Step 3: Cross multiply
    921.47x = 1,381.99 × 263.33
  4. Step 4: Simplify right side
    921.47x = 363,922.22
  5. Step 5: Solve for x
    x = 363,922.22/921.47
  6. Step 6: Final answer
    x = 394.94

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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.