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Finding the Fourth Proportional to 1,223.30, 1,687.75 and 692.12

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Solution

The fourth proportional to 1,223.30, 1,687.75 and 692.12 is: 954.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.30 : 1,687.75 = 692.12 : x
  2. Step 2: Convert to fraction form
    1,223.30/1,687.75 = 692.12/x
  3. Step 3: Cross multiply
    1,223.30x = 1,687.75 × 692.12
  4. Step 4: Simplify right side
    1,223.30x = 1,168,128.02
  5. Step 5: Solve for x
    x = 1,168,128.02/1,223.30
  6. Step 6: Final answer
    x = 954.90

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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.