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Finding the Fourth Proportional to 1,994.16, 2,991.48 and 1,421.76

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Solution

The fourth proportional to 1,994.16, 2,991.48 and 1,421.76 is: 2,132.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,994.16 : 2,991.48 = 1,421.76 : x
  2. Step 2: Convert to fraction form
    1,994.16/2,991.48 = 1,421.76/x
  3. Step 3: Cross multiply
    1,994.16x = 2,991.48 × 1,421.76
  4. Step 4: Simplify right side
    1,994.16x = 4,253,166.60
  5. Step 5: Solve for x
    x = 4,253,166.60/1,994.16
  6. Step 6: Final answer
    x = 2,132.81

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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.