Home / 1,370.90-2,051.56-1,121.21

Finding the Fourth Proportional to 1,370.90, 2,051.56 and 1,121.21

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Solution

The fourth proportional to 1,370.90, 2,051.56 and 1,121.21 is: 1,677.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.90 : 2,051.56 = 1,121.21 : x
  2. Step 2: Convert to fraction form
    1,370.90/2,051.56 = 1,121.21/x
  3. Step 3: Cross multiply
    1,370.90x = 2,051.56 × 1,121.21
  4. Step 4: Simplify right side
    1,370.90x = 2,300,231.91
  5. Step 5: Solve for x
    x = 2,300,231.91/1,370.90
  6. Step 6: Final answer
    x = 1,677.91

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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.