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Finding the Fourth Proportional to 692.39, 1,038.60 and 281.51

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Solution

The fourth proportional to 692.39, 1,038.60 and 281.51 is: 422.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.39 : 1,038.60 = 281.51 : x
  2. Step 2: Convert to fraction form
    692.39/1,038.60 = 281.51/x
  3. Step 3: Cross multiply
    692.39x = 1,038.60 × 281.51
  4. Step 4: Simplify right side
    692.39x = 292,376.29
  5. Step 5: Solve for x
    x = 292,376.29/692.39
  6. Step 6: Final answer
    x = 422.27

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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.