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Finding the Fourth Proportional to 1,038.82, 1,558.74 and 422.95

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Solution

The fourth proportional to 1,038.82, 1,558.74 and 422.95 is: 634.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.82 : 1,558.74 = 422.95 : x
  2. Step 2: Convert to fraction form
    1,038.82/1,558.74 = 422.95/x
  3. Step 3: Cross multiply
    1,038.82x = 1,558.74 × 422.95
  4. Step 4: Simplify right side
    1,038.82x = 659,269.08
  5. Step 5: Solve for x
    x = 659,269.08/1,038.82
  6. Step 6: Final answer
    x = 634.63

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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.