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Finding the Fourth Proportional to 692, 1,038 and 418.40

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Solution

The fourth proportional to 692, 1,038 and 418.40 is: 627.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    692 : 1,038 = 418.40 : x
  2. Step 2: Convert to fraction form
    692/1,038 = 418.40/x
  3. Step 3: Cross multiply
    692x = 1,038 × 418.40
  4. Step 4: Simplify right side
    692x = 434,299.20
  5. Step 5: Solve for x
    x = 434,299.20/692
  6. Step 6: Final answer
    x = 627.60

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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.