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Finding the Fourth Proportional to 30,189.60, 45,300.60 and 12,661.20

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Solution

The fourth proportional to 30,189.60, 45,300.60 and 12,661.20 is: 18,998.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,189.60 : 45,300.60 = 12,661.20 : x
  2. Step 2: Convert to fraction form
    30,189.60/45,300.60 = 12,661.20/x
  3. Step 3: Cross multiply
    30,189.60x = 45,300.60 × 12,661.20
  4. Step 4: Simplify right side
    30,189.60x = 573,559,956.72
  5. Step 5: Solve for x
    x = 573,559,956.72/30,189.60
  6. Step 6: Final answer
    x = 18,998.59

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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.