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Finding the Fourth Proportional to 1,280.94, 1,920.57 and 458.79

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Solution

The fourth proportional to 1,280.94, 1,920.57 and 458.79 is: 687.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.94 : 1,920.57 = 458.79 : x
  2. Step 2: Convert to fraction form
    1,280.94/1,920.57 = 458.79/x
  3. Step 3: Cross multiply
    1,280.94x = 1,920.57 × 458.79
  4. Step 4: Simplify right side
    1,280.94x = 881,138.31
  5. Step 5: Solve for x
    x = 881,138.31/1,280.94
  6. Step 6: Final answer
    x = 687.88

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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.