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Finding the Fourth Proportional to 85,920.40, 128,880.60 and 84,608.20

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Solution

The fourth proportional to 85,920.40, 128,880.60 and 84,608.20 is: 126,912.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.40 : 128,880.60 = 84,608.20 : x
  2. Step 2: Convert to fraction form
    85,920.40/128,880.60 = 84,608.20/x
  3. Step 3: Cross multiply
    85,920.40x = 128,880.60 × 84,608.20
  4. Step 4: Simplify right side
    85,920.40x = 10,904,355,580.92
  5. Step 5: Solve for x
    x = 10,904,355,580.92/85,920.40
  6. Step 6: Final answer
    x = 126,912.30

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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.