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Finding the Fourth Proportional to 921, 1,379.04 and 555.28

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Solution

The fourth proportional to 921, 1,379.04 and 555.28 is: 831.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    921 : 1,379.04 = 555.28 : x
  2. Step 2: Convert to fraction form
    921/1,379.04 = 555.28/x
  3. Step 3: Cross multiply
    921x = 1,379.04 × 555.28
  4. Step 4: Simplify right side
    921x = 765,753.33
  5. Step 5: Solve for x
    x = 765,753.33/921
  6. Step 6: Final answer
    x = 831.44

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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.