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Finding the Fourth Proportional to 435.87, 653.74 and 111.21

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Solution

The fourth proportional to 435.87, 653.74 and 111.21 is: 166.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.87 : 653.74 = 111.21 : x
  2. Step 2: Convert to fraction form
    435.87/653.74 = 111.21/x
  3. Step 3: Cross multiply
    435.87x = 653.74 × 111.21
  4. Step 4: Simplify right side
    435.87x = 72,702.43
  5. Step 5: Solve for x
    x = 72,702.43/435.87
  6. Step 6: Final answer
    x = 166.80

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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.