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Finding the Fourth Proportional to 5,123.80, 7,692.90 and 3,179.80

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Solution

The fourth proportional to 5,123.80, 7,692.90 and 3,179.80 is: 4,774.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,123.80 : 7,692.90 = 3,179.80 : x
  2. Step 2: Convert to fraction form
    5,123.80/7,692.90 = 3,179.80/x
  3. Step 3: Cross multiply
    5,123.80x = 7,692.90 × 3,179.80
  4. Step 4: Simplify right side
    5,123.80x = 24,461,883.42
  5. Step 5: Solve for x
    x = 24,461,883.42/5,123.80
  6. Step 6: Final answer
    x = 4,774.17

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1.5x scale

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.