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Finding the Fourth Proportional to 78,857,138.45, 118,285,707.68 and 78,857,138.45

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Solution

The fourth proportional to 78,857,138.45, 118,285,707.68 and 78,857,138.45 is: 118,285,707.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,857,138.45 : 118,285,707.68 = 78,857,138.45 : x
  2. Step 2: Convert to fraction form
    78,857,138.45/118,285,707.68 = 78,857,138.45/x
  3. Step 3: Cross multiply
    78,857,138.45x = 118,285,707.68 × 78,857,138.45
  4. Step 4: Simplify right side
    78,857,138.45x = 9,327,672,426,783,702
  5. Step 5: Solve for x
    x = 9,327,672,426,783,702/78,857,138.45
  6. Step 6: Final answer
    x = 118,285,707.68

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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.