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Finding the Fourth Proportional to 692.43, 955.28 and 485.55

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Solution

The fourth proportional to 692.43, 955.28 and 485.55 is: 669.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.43 : 955.28 = 485.55 : x
  2. Step 2: Convert to fraction form
    692.43/955.28 = 485.55/x
  3. Step 3: Cross multiply
    692.43x = 955.28 × 485.55
  4. Step 4: Simplify right side
    692.43x = 463,833.78
  5. Step 5: Solve for x
    x = 463,833.78/692.43
  6. Step 6: Final answer
    x = 669.86

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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.