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Finding the Fourth Proportional to 1,039.18, 1,558.31 and 389.46

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Solution

The fourth proportional to 1,039.18, 1,558.31 and 389.46 is: 584.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.18 : 1,558.31 = 389.46 : x
  2. Step 2: Convert to fraction form
    1,039.18/1,558.31 = 389.46/x
  3. Step 3: Cross multiply
    1,039.18x = 1,558.31 × 389.46
  4. Step 4: Simplify right side
    1,039.18x = 606,891.62
  5. Step 5: Solve for x
    x = 606,891.62/1,039.18
  6. Step 6: Final answer
    x = 584.01

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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.