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Finding the Fourth Proportional to 927.21, 1,390.99 and 379.43

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Solution

The fourth proportional to 927.21, 1,390.99 and 379.43 is: 569.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.21 : 1,390.99 = 379.43 : x
  2. Step 2: Convert to fraction form
    927.21/1,390.99 = 379.43/x
  3. Step 3: Cross multiply
    927.21x = 1,390.99 × 379.43
  4. Step 4: Simplify right side
    927.21x = 527,783.34
  5. Step 5: Solve for x
    x = 527,783.34/927.21
  6. Step 6: Final answer
    x = 569.22

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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.