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Finding the Fourth Proportional to 1,718.75, 2,578.13 and 692.75

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Solution

The fourth proportional to 1,718.75, 2,578.13 and 692.75 is: 1,039.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.75 : 2,578.13 = 692.75 : x
  2. Step 2: Convert to fraction form
    1,718.75/2,578.13 = 692.75/x
  3. Step 3: Cross multiply
    1,718.75x = 2,578.13 × 692.75
  4. Step 4: Simplify right side
    1,718.75x = 1,785,999.56
  5. Step 5: Solve for x
    x = 1,785,999.56/1,718.75
  6. Step 6: Final answer
    x = 1,039.13

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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.