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Finding the Fourth Proportional to 1,280.66, 1,920.77 and 356.31

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Solution

The fourth proportional to 1,280.66, 1,920.77 and 356.31 is: 534.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.66 : 1,920.77 = 356.31 : x
  2. Step 2: Convert to fraction form
    1,280.66/1,920.77 = 356.31/x
  3. Step 3: Cross multiply
    1,280.66x = 1,920.77 × 356.31
  4. Step 4: Simplify right side
    1,280.66x = 684,388.05
  5. Step 5: Solve for x
    x = 684,388.05/1,280.66
  6. Step 6: Final answer
    x = 534.40

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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.