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Finding the Fourth Proportional to 78,302,811.80, 117,454,217.70 and 20,803,957.40

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Solution

The fourth proportional to 78,302,811.80, 117,454,217.70 and 20,803,957.40 is: 31,205,936.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,302,811.80 : 117,454,217.70 = 20,803,957.40 : x
  2. Step 2: Convert to fraction form
    78,302,811.80/117,454,217.70 = 20,803,957.40/x
  3. Step 3: Cross multiply
    78,302,811.80x = 117,454,217.70 × 20,803,957.40
  4. Step 4: Simplify right side
    78,302,811.80x = 2,443,512,541,481,126
  5. Step 5: Solve for x
    x = 2,443,512,541,481,126/78,302,811.80
  6. Step 6: Final answer
    x = 31,205,936.10

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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.