Home / 1,281.40-1,922.13-459.73

Finding the Fourth Proportional to 1,281.40, 1,922.13 and 459.73

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Solution

The fourth proportional to 1,281.40, 1,922.13 and 459.73 is: 689.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.40 : 1,922.13 = 459.73 : x
  2. Step 2: Convert to fraction form
    1,281.40/1,922.13 = 459.73/x
  3. Step 3: Cross multiply
    1,281.40x = 1,922.13 × 459.73
  4. Step 4: Simplify right side
    1,281.40x = 883,660.82
  5. Step 5: Solve for x
    x = 883,660.82/1,281.40
  6. Step 6: Final answer
    x = 689.61

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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.