Home / 1,319.42-1,820.62-1,121.05

Finding the Fourth Proportional to 1,319.42, 1,820.62 and 1,121.05

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Solution

The fourth proportional to 1,319.42, 1,820.62 and 1,121.05 is: 1,546.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.42 : 1,820.62 = 1,121.05 : x
  2. Step 2: Convert to fraction form
    1,319.42/1,820.62 = 1,121.05/x
  3. Step 3: Cross multiply
    1,319.42x = 1,820.62 × 1,121.05
  4. Step 4: Simplify right side
    1,319.42x = 2,041,006.05
  5. Step 5: Solve for x
    x = 2,041,006.05/1,319.42
  6. Step 6: Final answer
    x = 1,546.90

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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.