Home / 3,178.68-4,386.39-1,781.40

Finding the Fourth Proportional to 3,178.68, 4,386.39 and 1,781.40

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Solution

The fourth proportional to 3,178.68, 4,386.39 and 1,781.40 is: 2,458.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.68 : 4,386.39 = 1,781.40 : x
  2. Step 2: Convert to fraction form
    3,178.68/4,386.39 = 1,781.40/x
  3. Step 3: Cross multiply
    3,178.68x = 4,386.39 × 1,781.40
  4. Step 4: Simplify right side
    3,178.68x = 7,813,915.15
  5. Step 5: Solve for x
    x = 7,813,915.15/3,178.68
  6. Step 6: Final answer
    x = 2,458.23

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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.