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Finding the Fourth Proportional to 1,625.62, 2,438.44 and 638.90

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Solution

The fourth proportional to 1,625.62, 2,438.44 and 638.90 is: 958.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,625.62 : 2,438.44 = 638.90 : x
  2. Step 2: Convert to fraction form
    1,625.62/2,438.44 = 638.90/x
  3. Step 3: Cross multiply
    1,625.62x = 2,438.44 × 638.90
  4. Step 4: Simplify right side
    1,625.62x = 1,557,919.32
  5. Step 5: Solve for x
    x = 1,557,919.32/1,625.62
  6. Step 6: Final answer
    x = 958.35

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.