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Finding the Fourth Proportional to 1,280.81, 1,921.19 and 356.33

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Solution

The fourth proportional to 1,280.81, 1,921.19 and 356.33 is: 534.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.81 : 1,921.19 = 356.33 : x
  2. Step 2: Convert to fraction form
    1,280.81/1,921.19 = 356.33/x
  3. Step 3: Cross multiply
    1,280.81x = 1,921.19 × 356.33
  4. Step 4: Simplify right side
    1,280.81x = 684,580.65
  5. Step 5: Solve for x
    x = 684,580.65/1,280.81
  6. Step 6: Final answer
    x = 534.49

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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.