Home / 1,920.30-2,880.45-621.74

Finding the Fourth Proportional to 1,920.30, 2,880.45 and 621.74

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Solution

The fourth proportional to 1,920.30, 2,880.45 and 621.74 is: 932.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.30 : 2,880.45 = 621.74 : x
  2. Step 2: Convert to fraction form
    1,920.30/2,880.45 = 621.74/x
  3. Step 3: Cross multiply
    1,920.30x = 2,880.45 × 621.74
  4. Step 4: Simplify right side
    1,920.30x = 1,790,890.98
  5. Step 5: Solve for x
    x = 1,790,890.98/1,920.30
  6. Step 6: Final answer
    x = 932.61

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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.