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Finding the Fourth Proportional to 692.11, 1,038.57 and 384.22

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Solution

The fourth proportional to 692.11, 1,038.57 and 384.22 is: 576.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.11 : 1,038.57 = 384.22 : x
  2. Step 2: Convert to fraction form
    692.11/1,038.57 = 384.22/x
  3. Step 3: Cross multiply
    692.11x = 1,038.57 × 384.22
  4. Step 4: Simplify right side
    692.11x = 399,039.37
  5. Step 5: Solve for x
    x = 399,039.37/692.11
  6. Step 6: Final answer
    x = 576.55

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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.