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Finding the Fourth Proportional to 80,919,006.40, 121,378,509.60 and 80,919,006.40

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Solution

The fourth proportional to 80,919,006.40, 121,378,509.60 and 80,919,006.40 is: 121,378,509.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,919,006.40 : 121,378,509.60 = 80,919,006.40 : x
  2. Step 2: Convert to fraction form
    80,919,006.40/121,378,509.60 = 80,919,006.40/x
  3. Step 3: Cross multiply
    80,919,006.40x = 121,378,509.60 × 80,919,006.40
  4. Step 4: Simplify right side
    80,919,006.40x = 9,821,828,395,144,862
  5. Step 5: Solve for x
    x = 9,821,828,395,144,862/80,919,006.40
  6. Step 6: Final answer
    x = 121,378,509.60

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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.