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Finding the Fourth Proportional to 1,038.89, 1,558.31 and 389.61

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Solution

The fourth proportional to 1,038.89, 1,558.31 and 389.61 is: 584.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.89 : 1,558.31 = 389.61 : x
  2. Step 2: Convert to fraction form
    1,038.89/1,558.31 = 389.61/x
  3. Step 3: Cross multiply
    1,038.89x = 1,558.31 × 389.61
  4. Step 4: Simplify right side
    1,038.89x = 607,131.21
  5. Step 5: Solve for x
    x = 607,131.21/1,038.89
  6. Step 6: Final answer
    x = 584.40

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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.