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Finding the Fourth Proportional to 128,608.80, 192,913.20 and 45,511.20

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Solution

The fourth proportional to 128,608.80, 192,913.20 and 45,511.20 is: 68,266.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,608.80 : 192,913.20 = 45,511.20 : x
  2. Step 2: Convert to fraction form
    128,608.80/192,913.20 = 45,511.20/x
  3. Step 3: Cross multiply
    128,608.80x = 192,913.20 × 45,511.20
  4. Step 4: Simplify right side
    128,608.80x = 8,779,711,227.84
  5. Step 5: Solve for x
    x = 8,779,711,227.84/128,608.80
  6. Step 6: Final answer
    x = 68,266.80

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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.