Home / 1,121.42-1,680.36-1,005.24

Finding the Fourth Proportional to 1,121.42, 1,680.36 and 1,005.24

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Solution

The fourth proportional to 1,121.42, 1,680.36 and 1,005.24 is: 1,506.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.42 : 1,680.36 = 1,005.24 : x
  2. Step 2: Convert to fraction form
    1,121.42/1,680.36 = 1,005.24/x
  3. Step 3: Cross multiply
    1,121.42x = 1,680.36 × 1,005.24
  4. Step 4: Simplify right side
    1,121.42x = 1,689,165.09
  5. Step 5: Solve for x
    x = 1,689,165.09/1,121.42
  6. Step 6: Final answer
    x = 1,506.27

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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.