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Finding the Fourth Proportional to 1,038.21, 1,557.99 and 422.43

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Solution

The fourth proportional to 1,038.21, 1,557.99 and 422.43 is: 633.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.21 : 1,557.99 = 422.43 : x
  2. Step 2: Convert to fraction form
    1,038.21/1,557.99 = 422.43/x
  3. Step 3: Cross multiply
    1,038.21x = 1,557.99 × 422.43
  4. Step 4: Simplify right side
    1,038.21x = 658,141.72
  5. Step 5: Solve for x
    x = 658,141.72/1,038.21
  6. Step 6: Final answer
    x = 633.92

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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.