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Finding the Fourth Proportional to 1,289.34, 1,777.05 and 939.42

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Solution

The fourth proportional to 1,289.34, 1,777.05 and 939.42 is: 1,294.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.34 : 1,777.05 = 939.42 : x
  2. Step 2: Convert to fraction form
    1,289.34/1,777.05 = 939.42/x
  3. Step 3: Cross multiply
    1,289.34x = 1,777.05 × 939.42
  4. Step 4: Simplify right side
    1,289.34x = 1,669,396.31
  5. Step 5: Solve for x
    x = 1,669,396.31/1,289.34
  6. Step 6: Final answer
    x = 1,294.77

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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.