Home / 1,991.20-2,744.10-1,430.68

Finding the Fourth Proportional to 1,991.20, 2,744.10 and 1,430.68

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Solution

The fourth proportional to 1,991.20, 2,744.10 and 1,430.68 is: 1,971.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.20 : 2,744.10 = 1,430.68 : x
  2. Step 2: Convert to fraction form
    1,991.20/2,744.10 = 1,430.68/x
  3. Step 3: Cross multiply
    1,991.20x = 2,744.10 × 1,430.68
  4. Step 4: Simplify right side
    1,991.20x = 3,925,928.99
  5. Step 5: Solve for x
    x = 3,925,928.99/1,991.20
  6. Step 6: Final answer
    x = 1,971.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.