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Finding the Fourth Proportional to 663,879,901.20, 995,819,851.80 and 644,748,025.20

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Solution

The fourth proportional to 663,879,901.20, 995,819,851.80 and 644,748,025.20 is: 967,122,037.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,879,901.20 : 995,819,851.80 = 644,748,025.20 : x
  2. Step 2: Convert to fraction form
    663,879,901.20/995,819,851.80 = 644,748,025.20/x
  3. Step 3: Cross multiply
    663,879,901.20x = 995,819,851.80 × 644,748,025.20
  4. Step 4: Simplify right side
    663,879,901.20x = 642,052,882,903,006,720
  5. Step 5: Solve for x
    x = 642,052,882,903,006,720/663,879,901.20
  6. Step 6: Final answer
    x = 967,122,037.80

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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.