Home / 3,856.12-5,782.98-1,390.62

Finding the Fourth Proportional to 3,856.12, 5,782.98 and 1,390.62

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Solution

The fourth proportional to 3,856.12, 5,782.98 and 1,390.62 is: 2,085.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,856.12 : 5,782.98 = 1,390.62 : x
  2. Step 2: Convert to fraction form
    3,856.12/5,782.98 = 1,390.62/x
  3. Step 3: Cross multiply
    3,856.12x = 5,782.98 × 1,390.62
  4. Step 4: Simplify right side
    3,856.12x = 8,041,920.06
  5. Step 5: Solve for x
    x = 8,041,920.06/3,856.12
  6. Step 6: Final answer
    x = 2,085.50

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Half scale
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Double scale
Find fourth proportional to 3,857.12, 5,784.48 and 1,391.62
Similar ratio
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1.5x scale

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.