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Finding the Fourth Proportional to 718.50, 1,078.83 and 692.31

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Solution

The fourth proportional to 718.50, 1,078.83 and 692.31 is: 1,039.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.50 : 1,078.83 = 692.31 : x
  2. Step 2: Convert to fraction form
    718.50/1,078.83 = 692.31/x
  3. Step 3: Cross multiply
    718.50x = 1,078.83 × 692.31
  4. Step 4: Simplify right side
    718.50x = 746,884.80
  5. Step 5: Solve for x
    x = 746,884.80/718.50
  6. Step 6: Final answer
    x = 1,039.51

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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.