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Finding the Fourth Proportional to 318,408.60, 477,612.90 and 212,120.40

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Solution

The fourth proportional to 318,408.60, 477,612.90 and 212,120.40 is: 318,180.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,408.60 : 477,612.90 = 212,120.40 : x
  2. Step 2: Convert to fraction form
    318,408.60/477,612.90 = 212,120.40/x
  3. Step 3: Cross multiply
    318,408.60x = 477,612.90 × 212,120.40
  4. Step 4: Simplify right side
    318,408.60x = 101,311,439,393.16
  5. Step 5: Solve for x
    x = 101,311,439,393.16/318,408.60
  6. Step 6: Final answer
    x = 318,180.60

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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.