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Finding the Fourth Proportional to 1,119.50, 1,679.40 and 389.28

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Solution

The fourth proportional to 1,119.50, 1,679.40 and 389.28 is: 583.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.50 : 1,679.40 = 389.28 : x
  2. Step 2: Convert to fraction form
    1,119.50/1,679.40 = 389.28/x
  3. Step 3: Cross multiply
    1,119.50x = 1,679.40 × 389.28
  4. Step 4: Simplify right side
    1,119.50x = 653,756.83
  5. Step 5: Solve for x
    x = 653,756.83/1,119.50
  6. Step 6: Final answer
    x = 583.97

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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.