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Finding the Fourth Proportional to 921.08, 1,378.82 and 508.97

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Solution

The fourth proportional to 921.08, 1,378.82 and 508.97 is: 761.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.08 : 1,378.82 = 508.97 : x
  2. Step 2: Convert to fraction form
    921.08/1,378.82 = 508.97/x
  3. Step 3: Cross multiply
    921.08x = 1,378.82 × 508.97
  4. Step 4: Simplify right side
    921.08x = 701,778.02
  5. Step 5: Solve for x
    x = 701,778.02/921.08
  6. Step 6: Final answer
    x = 761.91

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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.