Home / 1,378.42-2,068.99-1,121.45

Finding the Fourth Proportional to 1,378.42, 2,068.99 and 1,121.45

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Solution

The fourth proportional to 1,378.42, 2,068.99 and 1,121.45 is: 1,683.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.42 : 2,068.99 = 1,121.45 : x
  2. Step 2: Convert to fraction form
    1,378.42/2,068.99 = 1,121.45/x
  3. Step 3: Cross multiply
    1,378.42x = 2,068.99 × 1,121.45
  4. Step 4: Simplify right side
    1,378.42x = 2,320,262.00
  5. Step 5: Solve for x
    x = 2,320,262.00/1,378.42
  6. Step 6: Final answer
    x = 1,683.28

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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.