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Finding the Fourth Proportional to 120,622.40, 180,933.60 and 85,630.40

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Solution

The fourth proportional to 120,622.40, 180,933.60 and 85,630.40 is: 128,445.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,622.40 : 180,933.60 = 85,630.40 : x
  2. Step 2: Convert to fraction form
    120,622.40/180,933.60 = 85,630.40/x
  3. Step 3: Cross multiply
    120,622.40x = 180,933.60 × 85,630.40
  4. Step 4: Simplify right side
    120,622.40x = 15,493,416,541.44
  5. Step 5: Solve for x
    x = 15,493,416,541.44/120,622.40
  6. Step 6: Final answer
    x = 128,445.60

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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.