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Finding the Fourth Proportional to 12,692.40, 19,038.60 and 3,928.20

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Solution

The fourth proportional to 12,692.40, 19,038.60 and 3,928.20 is: 5,892.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,692.40 : 19,038.60 = 3,928.20 : x
  2. Step 2: Convert to fraction form
    12,692.40/19,038.60 = 3,928.20/x
  3. Step 3: Cross multiply
    12,692.40x = 19,038.60 × 3,928.20
  4. Step 4: Simplify right side
    12,692.40x = 74,787,428.52
  5. Step 5: Solve for x
    x = 74,787,428.52/12,692.40
  6. Step 6: Final answer
    x = 5,892.30

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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.