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Finding the Fourth Proportional to 1,038.75, 1,558.13 and 422.79

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Solution

The fourth proportional to 1,038.75, 1,558.13 and 422.79 is: 634.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.75 : 1,558.13 = 422.79 : x
  2. Step 2: Convert to fraction form
    1,038.75/1,558.13 = 422.79/x
  3. Step 3: Cross multiply
    1,038.75x = 1,558.13 × 422.79
  4. Step 4: Simplify right side
    1,038.75x = 658,759.67
  5. Step 5: Solve for x
    x = 658,759.67/1,038.75
  6. Step 6: Final answer
    x = 634.19

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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.