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Finding the Fourth Proportional to 692.45, 1,038.57 and 418.47

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Solution

The fourth proportional to 692.45, 1,038.57 and 418.47 is: 627.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.45 : 1,038.57 = 418.47 : x
  2. Step 2: Convert to fraction form
    692.45/1,038.57 = 418.47/x
  3. Step 3: Cross multiply
    692.45x = 1,038.57 × 418.47
  4. Step 4: Simplify right side
    692.45x = 434,607.28
  5. Step 5: Solve for x
    x = 434,607.28/692.45
  6. Step 6: Final answer
    x = 627.64

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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.