Home / 1,280.16-1,920.48-414.36

Finding the Fourth Proportional to 1,280.16, 1,920.48 and 414.36

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Solution

The fourth proportional to 1,280.16, 1,920.48 and 414.36 is: 621.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.16 : 1,920.48 = 414.36 : x
  2. Step 2: Convert to fraction form
    1,280.16/1,920.48 = 414.36/x
  3. Step 3: Cross multiply
    1,280.16x = 1,920.48 × 414.36
  4. Step 4: Simplify right side
    1,280.16x = 795,770.09
  5. Step 5: Solve for x
    x = 795,770.09/1,280.16
  6. Step 6: Final answer
    x = 621.62

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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.