Home / 1,920.13-2,880.60-621.70

Finding the Fourth Proportional to 1,920.13, 2,880.60 and 621.70

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Solution

The fourth proportional to 1,920.13, 2,880.60 and 621.70 is: 932.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.13 : 2,880.60 = 621.70 : x
  2. Step 2: Convert to fraction form
    1,920.13/2,880.60 = 621.70/x
  3. Step 3: Cross multiply
    1,920.13x = 2,880.60 × 621.70
  4. Step 4: Simplify right side
    1,920.13x = 1,790,869.02
  5. Step 5: Solve for x
    x = 1,790,869.02/1,920.13
  6. Step 6: Final answer
    x = 932.68

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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.