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Finding the Fourth Proportional to 253,728.72, 380,649.24 and 85,255.20

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Solution

The fourth proportional to 253,728.72, 380,649.24 and 85,255.20 is: 127,901.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    253,728.72 : 380,649.24 = 85,255.20 : x
  2. Step 2: Convert to fraction form
    253,728.72/380,649.24 = 85,255.20/x
  3. Step 3: Cross multiply
    253,728.72x = 380,649.24 × 85,255.20
  4. Step 4: Simplify right side
    253,728.72x = 32,452,327,086.05
  5. Step 5: Solve for x
    x = 32,452,327,086.05/253,728.72
  6. Step 6: Final answer
    x = 127,901.67

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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.