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Finding the Fourth Proportional to 77,947,680.40, 109,305,911.60 and 77,947,680.40

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Solution

The fourth proportional to 77,947,680.40, 109,305,911.60 and 77,947,680.40 is: 109,305,911.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,947,680.40 : 109,305,911.60 = 77,947,680.40 : x
  2. Step 2: Convert to fraction form
    77,947,680.40/109,305,911.60 = 77,947,680.40/x
  3. Step 3: Cross multiply
    77,947,680.40x = 109,305,911.60 × 77,947,680.40
  4. Step 4: Simplify right side
    77,947,680.40x = 8,520,142,263,227,453
  5. Step 5: Solve for x
    x = 8,520,142,263,227,453/77,947,680.40
  6. Step 6: Final answer
    x = 109,305,911.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.