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Finding the Fourth Proportional to 461.70, 692.55 and 388.80

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Solution

The fourth proportional to 461.70, 692.55 and 388.80 is: 583.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.70 : 692.55 = 388.80 : x
  2. Step 2: Convert to fraction form
    461.70/692.55 = 388.80/x
  3. Step 3: Cross multiply
    461.70x = 692.55 × 388.80
  4. Step 4: Simplify right side
    461.70x = 269,263.44
  5. Step 5: Solve for x
    x = 269,263.44/461.70
  6. Step 6: Final answer
    x = 583.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.