Home / 1,280.17-1,920.21-355.66

Finding the Fourth Proportional to 1,280.17, 1,920.21 and 355.66

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Solution

The fourth proportional to 1,280.17, 1,920.21 and 355.66 is: 533.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.17 : 1,920.21 = 355.66 : x
  2. Step 2: Convert to fraction form
    1,280.17/1,920.21 = 355.66/x
  3. Step 3: Cross multiply
    1,280.17x = 1,920.21 × 355.66
  4. Step 4: Simplify right side
    1,280.17x = 682,935.75
  5. Step 5: Solve for x
    x = 682,935.75/1,280.17
  6. Step 6: Final answer
    x = 533.47

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Double scale
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1.5x scale

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.