Home / 3,128.21-4,316.12-1,868.75

Finding the Fourth Proportional to 3,128.21, 4,316.12 and 1,868.75

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Solution

The fourth proportional to 3,128.21, 4,316.12 and 1,868.75 is: 2,578.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.21 : 4,316.12 = 1,868.75 : x
  2. Step 2: Convert to fraction form
    3,128.21/4,316.12 = 1,868.75/x
  3. Step 3: Cross multiply
    3,128.21x = 4,316.12 × 1,868.75
  4. Step 4: Simplify right side
    3,128.21x = 8,065,749.25
  5. Step 5: Solve for x
    x = 8,065,749.25/3,128.21
  6. Step 6: Final answer
    x = 2,578.39

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Double scale
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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.