Home / 1,121.70-1,686.60-1,097.40

Finding the Fourth Proportional to 1,121.70, 1,686.60 and 1,097.40

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Solution

The fourth proportional to 1,121.70, 1,686.60 and 1,097.40 is: 1,650.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.70 : 1,686.60 = 1,097.40 : x
  2. Step 2: Convert to fraction form
    1,121.70/1,686.60 = 1,097.40/x
  3. Step 3: Cross multiply
    1,121.70x = 1,686.60 × 1,097.40
  4. Step 4: Simplify right side
    1,121.70x = 1,850,874.84
  5. Step 5: Solve for x
    x = 1,850,874.84/1,121.70
  6. Step 6: Final answer
    x = 1,650.06

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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.