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Finding the Fourth Proportional to 2,140.75, 3,212.48 and 842.19

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Solution

The fourth proportional to 2,140.75, 3,212.48 and 842.19 is: 1,263.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.75 : 3,212.48 = 842.19 : x
  2. Step 2: Convert to fraction form
    2,140.75/3,212.48 = 842.19/x
  3. Step 3: Cross multiply
    2,140.75x = 3,212.48 × 842.19
  4. Step 4: Simplify right side
    2,140.75x = 2,705,518.53
  5. Step 5: Solve for x
    x = 2,705,518.53/2,140.75
  6. Step 6: Final answer
    x = 1,263.82

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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.