Home / 1,122.90-1,685.70-1,114.80

Finding the Fourth Proportional to 1,122.90, 1,685.70 and 1,114.80

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Solution

The fourth proportional to 1,122.90, 1,685.70 and 1,114.80 is: 1,673.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.90 : 1,685.70 = 1,114.80 : x
  2. Step 2: Convert to fraction form
    1,122.90/1,685.70 = 1,114.80/x
  3. Step 3: Cross multiply
    1,122.90x = 1,685.70 × 1,114.80
  4. Step 4: Simplify right side
    1,122.90x = 1,879,218.36
  5. Step 5: Solve for x
    x = 1,879,218.36/1,122.90
  6. Step 6: Final answer
    x = 1,673.54

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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.