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Finding the Fourth Proportional to 139,968,136.80, 209,952,205.20 and 120,484,591.20

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Solution

The fourth proportional to 139,968,136.80, 209,952,205.20 and 120,484,591.20 is: 180,726,886.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,136.80 : 209,952,205.20 = 120,484,591.20 : x
  2. Step 2: Convert to fraction form
    139,968,136.80/209,952,205.20 = 120,484,591.20/x
  3. Step 3: Cross multiply
    139,968,136.80x = 209,952,205.20 × 120,484,591.20
  4. Step 4: Simplify right side
    139,968,136.80x = 25,296,005,615,060,512
  5. Step 5: Solve for x
    x = 25,296,005,615,060,512/139,968,136.80
  6. Step 6: Final answer
    x = 180,726,886.80

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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.