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Finding the Fourth Proportional to 318,087.72, 477,120.60 and 81,432.44

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Solution

The fourth proportional to 318,087.72, 477,120.60 and 81,432.44 is: 122,145.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,087.72 : 477,120.60 = 81,432.44 : x
  2. Step 2: Convert to fraction form
    318,087.72/477,120.60 = 81,432.44/x
  3. Step 3: Cross multiply
    318,087.72x = 477,120.60 × 81,432.44
  4. Step 4: Simplify right side
    318,087.72x = 38,853,094,632.26
  5. Step 5: Solve for x
    x = 38,853,094,632.26/318,087.72
  6. Step 6: Final answer
    x = 122,145.85

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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.