Home / 1,280.23-1,920.33-330.39

Finding the Fourth Proportional to 1,280.23, 1,920.33 and 330.39

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Solution

The fourth proportional to 1,280.23, 1,920.33 and 330.39 is: 495.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.23 : 1,920.33 = 330.39 : x
  2. Step 2: Convert to fraction form
    1,280.23/1,920.33 = 330.39/x
  3. Step 3: Cross multiply
    1,280.23x = 1,920.33 × 330.39
  4. Step 4: Simplify right side
    1,280.23x = 634,457.83
  5. Step 5: Solve for x
    x = 634,457.83/1,280.23
  6. Step 6: Final answer
    x = 495.58

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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.