Home / 1,919.30-2,878.95-620.74

Finding the Fourth Proportional to 1,919.30, 2,878.95 and 620.74

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Solution

The fourth proportional to 1,919.30, 2,878.95 and 620.74 is: 931.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.30 : 2,878.95 = 620.74 : x
  2. Step 2: Convert to fraction form
    1,919.30/2,878.95 = 620.74/x
  3. Step 3: Cross multiply
    1,919.30x = 2,878.95 × 620.74
  4. Step 4: Simplify right side
    1,919.30x = 1,787,065.03
  5. Step 5: Solve for x
    x = 1,787,065.03/1,919.30
  6. Step 6: Final answer
    x = 931.10

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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.