Home / 3,178.74-4,386.81-1,919.76

Finding the Fourth Proportional to 3,178.74, 4,386.81 and 1,919.76

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Solution

The fourth proportional to 3,178.74, 4,386.81 and 1,919.76 is: 2,649.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.74 : 4,386.81 = 1,919.76 : x
  2. Step 2: Convert to fraction form
    3,178.74/4,386.81 = 1,919.76/x
  3. Step 3: Cross multiply
    3,178.74x = 4,386.81 × 1,919.76
  4. Step 4: Simplify right side
    3,178.74x = 8,421,622.37
  5. Step 5: Solve for x
    x = 8,421,622.37/3,178.74
  6. Step 6: Final answer
    x = 2,649.36

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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.