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Finding the Fourth Proportional to 1,282.05, 1,923.09 and 708.57

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Solution

The fourth proportional to 1,282.05, 1,923.09 and 708.57 is: 1,062.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.05 : 1,923.09 = 708.57 : x
  2. Step 2: Convert to fraction form
    1,282.05/1,923.09 = 708.57/x
  3. Step 3: Cross multiply
    1,282.05x = 1,923.09 × 708.57
  4. Step 4: Simplify right side
    1,282.05x = 1,362,643.88
  5. Step 5: Solve for x
    x = 1,362,643.88/1,282.05
  6. Step 6: Final answer
    x = 1,062.86

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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.