Home / 1,317.80-1,976.70-1,122.35

Finding the Fourth Proportional to 1,317.80, 1,976.70 and 1,122.35

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Solution

The fourth proportional to 1,317.80, 1,976.70 and 1,122.35 is: 1,683.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.80 : 1,976.70 = 1,122.35 : x
  2. Step 2: Convert to fraction form
    1,317.80/1,976.70 = 1,122.35/x
  3. Step 3: Cross multiply
    1,317.80x = 1,976.70 × 1,122.35
  4. Step 4: Simplify right side
    1,317.80x = 2,218,549.25
  5. Step 5: Solve for x
    x = 2,218,549.25/1,317.80
  6. Step 6: Final answer
    x = 1,683.53

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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.