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Finding the Fourth Proportional to 30,157.95, 45,236.92 and 20,660.90

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Solution

The fourth proportional to 30,157.95, 45,236.92 and 20,660.90 is: 30,991.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,157.95 : 45,236.92 = 20,660.90 : x
  2. Step 2: Convert to fraction form
    30,157.95/45,236.92 = 20,660.90/x
  3. Step 3: Cross multiply
    30,157.95x = 45,236.92 × 20,660.90
  4. Step 4: Simplify right side
    30,157.95x = 934,635,495.79
  5. Step 5: Solve for x
    x = 934,635,495.79/30,157.95
  6. Step 6: Final answer
    x = 30,991.35

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Similar ratio
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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.