Home / 78,280,015.70-117,420,023.55-66,690,665.30

Finding the Fourth Proportional to 78,280,015.70, 117,420,023.55 and 66,690,665.30

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Solution

The fourth proportional to 78,280,015.70, 117,420,023.55 and 66,690,665.30 is: 100,035,997.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,280,015.70 : 117,420,023.55 = 66,690,665.30 : x
  2. Step 2: Convert to fraction form
    78,280,015.70/117,420,023.55 = 66,690,665.30/x
  3. Step 3: Cross multiply
    78,280,015.70x = 117,420,023.55 × 66,690,665.30
  4. Step 4: Simplify right side
    78,280,015.70x = 7,830,819,490,091,167
  5. Step 5: Solve for x
    x = 7,830,819,490,091,167/78,280,015.70
  6. Step 6: Final answer
    x = 100,035,997.95

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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.