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Finding the Fourth Proportional to 139,968,143.20, 209,952,214.80 and 120,820,520.80

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Solution

The fourth proportional to 139,968,143.20, 209,952,214.80 and 120,820,520.80 is: 181,230,781.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,143.20 : 209,952,214.80 = 120,820,520.80 : x
  2. Step 2: Convert to fraction form
    139,968,143.20/209,952,214.80 = 120,820,520.80/x
  3. Step 3: Cross multiply
    139,968,143.20x = 209,952,214.80 × 120,820,520.80
  4. Step 4: Simplify right side
    139,968,143.20x = 25,366,535,935,249,468
  5. Step 5: Solve for x
    x = 25,366,535,935,249,468/139,968,143.20
  6. Step 6: Final answer
    x = 181,230,781.20

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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.