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Finding the Fourth Proportional to 921.14, 1,270.94 and 548.20

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Solution

The fourth proportional to 921.14, 1,270.94 and 548.20 is: 756.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.14 : 1,270.94 = 548.20 : x
  2. Step 2: Convert to fraction form
    921.14/1,270.94 = 548.20/x
  3. Step 3: Cross multiply
    921.14x = 1,270.94 × 548.20
  4. Step 4: Simplify right side
    921.14x = 696,729.31
  5. Step 5: Solve for x
    x = 696,729.31/921.14
  6. Step 6: Final answer
    x = 756.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.