Home / 3,854.40-5,782.35-1,389.42

Finding the Fourth Proportional to 3,854.40, 5,782.35 and 1,389.42

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Solution

The fourth proportional to 3,854.40, 5,782.35 and 1,389.42 is: 2,084.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,854.40 : 5,782.35 = 1,389.42 : x
  2. Step 2: Convert to fraction form
    3,854.40/5,782.35 = 1,389.42/x
  3. Step 3: Cross multiply
    3,854.40x = 5,782.35 × 1,389.42
  4. Step 4: Simplify right side
    3,854.40x = 8,034,112.74
  5. Step 5: Solve for x
    x = 8,034,112.74/3,854.40
  6. Step 6: Final answer
    x = 2,084.40

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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.