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Finding the Fourth Proportional to 139,968,137.70, 209,952,206.55 and 128,063,859.30

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Solution

The fourth proportional to 139,968,137.70, 209,952,206.55 and 128,063,859.30 is: 192,095,788.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,137.70 : 209,952,206.55 = 128,063,859.30 : x
  2. Step 2: Convert to fraction form
    139,968,137.70/209,952,206.55 = 128,063,859.30/x
  3. Step 3: Cross multiply
    139,968,137.70x = 209,952,206.55 × 128,063,859.30
  4. Step 4: Simplify right side
    139,968,137.70x = 26,887,289,839,343,740
  5. Step 5: Solve for x
    x = 26,887,289,839,343,740/139,968,137.70
  6. Step 6: Final answer
    x = 192,095,788.95

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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.