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Finding the Fourth Proportional to 1,223.41, 1,687.89 and 692.22

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Solution

The fourth proportional to 1,223.41, 1,687.89 and 692.22 is: 955.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.41 : 1,687.89 = 692.22 : x
  2. Step 2: Convert to fraction form
    1,223.41/1,687.89 = 692.22/x
  3. Step 3: Cross multiply
    1,223.41x = 1,687.89 × 692.22
  4. Step 4: Simplify right side
    1,223.41x = 1,168,387.48
  5. Step 5: Solve for x
    x = 1,168,387.48/1,223.41
  6. Step 6: Final answer
    x = 955.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.