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Finding the Fourth Proportional to 692.06, 1,038.33 and 418.35

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Solution

The fourth proportional to 692.06, 1,038.33 and 418.35 is: 627.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.06 : 1,038.33 = 418.35 : x
  2. Step 2: Convert to fraction form
    692.06/1,038.33 = 418.35/x
  3. Step 3: Cross multiply
    692.06x = 1,038.33 × 418.35
  4. Step 4: Simplify right side
    692.06x = 434,385.36
  5. Step 5: Solve for x
    x = 434,385.36/692.06
  6. Step 6: Final answer
    x = 627.67

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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.