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Finding the Fourth Proportional to 1,223.34, 1,687.77 and 692.14

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Solution

The fourth proportional to 1,223.34, 1,687.77 and 692.14 is: 954.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.34 : 1,687.77 = 692.14 : x
  2. Step 2: Convert to fraction form
    1,223.34/1,687.77 = 692.14/x
  3. Step 3: Cross multiply
    1,223.34x = 1,687.77 × 692.14
  4. Step 4: Simplify right side
    1,223.34x = 1,168,173.13
  5. Step 5: Solve for x
    x = 1,168,173.13/1,223.34
  6. Step 6: Final answer
    x = 954.90

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1.5x scale

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.