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Finding the Fourth Proportional to 1,038.80, 1,558.42 and 389.54

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Solution

The fourth proportional to 1,038.80, 1,558.42 and 389.54 is: 584.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.80 : 1,558.42 = 389.54 : x
  2. Step 2: Convert to fraction form
    1,038.80/1,558.42 = 389.54/x
  3. Step 3: Cross multiply
    1,038.80x = 1,558.42 × 389.54
  4. Step 4: Simplify right side
    1,038.80x = 607,069.85
  5. Step 5: Solve for x
    x = 607,069.85/1,038.80
  6. Step 6: Final answer
    x = 584.39

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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.