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Finding the Fourth Proportional to 78,761,143.80, 118,141,715.70 and 68,144,311.80

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Solution

The fourth proportional to 78,761,143.80, 118,141,715.70 and 68,144,311.80 is: 102,216,467.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,761,143.80 : 118,141,715.70 = 68,144,311.80 : x
  2. Step 2: Convert to fraction form
    78,761,143.80/118,141,715.70 = 68,144,311.80/x
  3. Step 3: Cross multiply
    78,761,143.80x = 118,141,715.70 × 68,144,311.80
  4. Step 4: Simplify right side
    78,761,143.80x = 8,050,685,911,247,755
  5. Step 5: Solve for x
    x = 8,050,685,911,247,755/78,761,143.80
  6. Step 6: Final answer
    x = 102,216,467.70

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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.