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Finding the Fourth Proportional to 78,981,203.80, 118,471,805.70 and 53,153,171.20

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Solution

The fourth proportional to 78,981,203.80, 118,471,805.70 and 53,153,171.20 is: 79,729,756.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,981,203.80 : 118,471,805.70 = 53,153,171.20 : x
  2. Step 2: Convert to fraction form
    78,981,203.80/118,471,805.70 = 53,153,171.20/x
  3. Step 3: Cross multiply
    78,981,203.80x = 118,471,805.70 × 53,153,171.20
  4. Step 4: Simplify right side
    78,981,203.80x = 6,297,152,170,745,236
  5. Step 5: Solve for x
    x = 6,297,152,170,745,236/78,981,203.80
  6. Step 6: Final answer
    x = 79,729,756.80

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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.