Home / 1,280.16-1,920.25-355.77

Finding the Fourth Proportional to 1,280.16, 1,920.25 and 355.77

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Solution

The fourth proportional to 1,280.16, 1,920.25 and 355.77 is: 533.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.16 : 1,920.25 = 355.77 : x
  2. Step 2: Convert to fraction form
    1,280.16/1,920.25 = 355.77/x
  3. Step 3: Cross multiply
    1,280.16x = 1,920.25 × 355.77
  4. Step 4: Simplify right side
    1,280.16x = 683,167.34
  5. Step 5: Solve for x
    x = 683,167.34/1,280.16
  6. Step 6: Final answer
    x = 533.66

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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.