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Finding the Fourth Proportional to 930,836,708.80, 1,396,255,063.20 and 917,231,819.20

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Solution

The fourth proportional to 930,836,708.80, 1,396,255,063.20 and 917,231,819.20 is: 1,375,847,728.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    930,836,708.80 : 1,396,255,063.20 = 917,231,819.20 : x
  2. Step 2: Convert to fraction form
    930,836,708.80/1,396,255,063.20 = 917,231,819.20/x
  3. Step 3: Cross multiply
    930,836,708.80x = 1,396,255,063.20 × 917,231,819.20
  4. Step 4: Simplify right side
    930,836,708.80x = 1,280,689,571,686,147,072
  5. Step 5: Solve for x
    x = 1,280,689,571,686,147,072/930,836,708.80
  6. Step 6: Final answer
    x = 1,375,847,728.80

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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.