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Finding the Fourth Proportional to 78,302,911.80, 117,454,367.70 and 20,804,057.40

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Solution

The fourth proportional to 78,302,911.80, 117,454,367.70 and 20,804,057.40 is: 31,206,086.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,302,911.80 : 117,454,367.70 = 20,804,057.40 : x
  2. Step 2: Convert to fraction form
    78,302,911.80/117,454,367.70 = 20,804,057.40/x
  3. Step 3: Cross multiply
    78,302,911.80x = 117,454,367.70 × 20,804,057.40
  4. Step 4: Simplify right side
    78,302,911.80x = 2,443,527,407,511,506
  5. Step 5: Solve for x
    x = 2,443,527,407,511,506/78,302,911.80
  6. Step 6: Final answer
    x = 31,206,086.10

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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.