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Finding the Fourth Proportional to 128,860,846.80, 193,078,693.80 and 109,728,970.80

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Solution

The fourth proportional to 128,860,846.80, 193,078,693.80 and 109,728,970.80 is: 164,412,440.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,860,846.80 : 193,078,693.80 = 109,728,970.80 : x
  2. Step 2: Convert to fraction form
    128,860,846.80/193,078,693.80 = 109,728,970.80/x
  3. Step 3: Cross multiply
    128,860,846.80x = 193,078,693.80 × 109,728,970.80
  4. Step 4: Simplify right side
    128,860,846.80x = 21,186,326,354,082,340
  5. Step 5: Solve for x
    x = 21,186,326,354,082,340/128,860,846.80
  6. Step 6: Final answer
    x = 164,412,440.86

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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.