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Finding the Fourth Proportional to 722.05, 990.29 and 692.28

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Solution

The fourth proportional to 722.05, 990.29 and 692.28 is: 949.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.05 : 990.29 = 692.28 : x
  2. Step 2: Convert to fraction form
    722.05/990.29 = 692.28/x
  3. Step 3: Cross multiply
    722.05x = 990.29 × 692.28
  4. Step 4: Simplify right side
    722.05x = 685,559.69
  5. Step 5: Solve for x
    x = 685,559.69/722.05
  6. Step 6: Final answer
    x = 949.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.