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Finding the Fourth Proportional to 921.14, 1,277.76 and 871.94

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Solution

The fourth proportional to 921.14, 1,277.76 and 871.94 is: 1,209.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.14 : 1,277.76 = 871.94 : x
  2. Step 2: Convert to fraction form
    921.14/1,277.76 = 871.94/x
  3. Step 3: Cross multiply
    921.14x = 1,277.76 × 871.94
  4. Step 4: Simplify right side
    921.14x = 1,114,130.05
  5. Step 5: Solve for x
    x = 1,114,130.05/921.14
  6. Step 6: Final answer
    x = 1,209.51

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.