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Finding the Fourth Proportional to 2,190.42, 3,285.98 and 874.17

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Solution

The fourth proportional to 2,190.42, 3,285.98 and 874.17 is: 1,311.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,190.42 : 3,285.98 = 874.17 : x
  2. Step 2: Convert to fraction form
    2,190.42/3,285.98 = 874.17/x
  3. Step 3: Cross multiply
    2,190.42x = 3,285.98 × 874.17
  4. Step 4: Simplify right side
    2,190.42x = 2,872,505.14
  5. Step 5: Solve for x
    x = 2,872,505.14/2,190.42
  6. Step 6: Final answer
    x = 1,311.39

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1.5x scale

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.