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Finding the Fourth Proportional to 1,119.42, 1,679.40 and 389.34

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Solution

The fourth proportional to 1,119.42, 1,679.40 and 389.34 is: 584.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.42 : 1,679.40 = 389.34 : x
  2. Step 2: Convert to fraction form
    1,119.42/1,679.40 = 389.34/x
  3. Step 3: Cross multiply
    1,119.42x = 1,679.40 × 389.34
  4. Step 4: Simplify right side
    1,119.42x = 653,857.60
  5. Step 5: Solve for x
    x = 653,857.60/1,119.42
  6. Step 6: Final answer
    x = 584.10

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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.