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Finding the Fourth Proportional to 1,038.76, 1,558.12 and 422.44

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Solution

The fourth proportional to 1,038.76, 1,558.12 and 422.44 is: 633.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.76 : 1,558.12 = 422.44 : x
  2. Step 2: Convert to fraction form
    1,038.76/1,558.12 = 422.44/x
  3. Step 3: Cross multiply
    1,038.76x = 1,558.12 × 422.44
  4. Step 4: Simplify right side
    1,038.76x = 658,212.21
  5. Step 5: Solve for x
    x = 658,212.21/1,038.76
  6. Step 6: Final answer
    x = 633.65

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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.