Home / 3,121.48-4,307.70-1,724.23

Finding the Fourth Proportional to 3,121.48, 4,307.70 and 1,724.23

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Solution

The fourth proportional to 3,121.48, 4,307.70 and 1,724.23 is: 2,379.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.48 : 4,307.70 = 1,724.23 : x
  2. Step 2: Convert to fraction form
    3,121.48/4,307.70 = 1,724.23/x
  3. Step 3: Cross multiply
    3,121.48x = 4,307.70 × 1,724.23
  4. Step 4: Simplify right side
    3,121.48x = 7,427,465.57
  5. Step 5: Solve for x
    x = 7,427,465.57/3,121.48
  6. Step 6: Final answer
    x = 2,379.47

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Half scale
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Double scale
Find fourth proportional to 3,122.48, 4,309.08 and 1,725.23
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.