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Finding the Fourth Proportional to 39,206.60, 58,809.90 and 12,912.20

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Solution

The fourth proportional to 39,206.60, 58,809.90 and 12,912.20 is: 19,368.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,206.60 : 58,809.90 = 12,912.20 : x
  2. Step 2: Convert to fraction form
    39,206.60/58,809.90 = 12,912.20/x
  3. Step 3: Cross multiply
    39,206.60x = 58,809.90 × 12,912.20
  4. Step 4: Simplify right side
    39,206.60x = 759,365,190.78
  5. Step 5: Solve for x
    x = 759,365,190.78/39,206.60
  6. Step 6: Final answer
    x = 19,368.30

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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.