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Finding the Fourth Proportional to 139,968,400.80, 209,952,601.20 and 120,484,855.20

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Solution

The fourth proportional to 139,968,400.80, 209,952,601.20 and 120,484,855.20 is: 180,727,282.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,400.80 : 209,952,601.20 = 120,484,855.20 : x
  2. Step 2: Convert to fraction form
    139,968,400.80/209,952,601.20 = 120,484,855.20/x
  3. Step 3: Cross multiply
    139,968,400.80x = 209,952,601.20 × 120,484,855.20
  4. Step 4: Simplify right side
    139,968,400.80x = 25,296,108,754,445,344
  5. Step 5: Solve for x
    x = 25,296,108,754,445,344/139,968,400.80
  6. Step 6: Final answer
    x = 180,727,282.80

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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.