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Finding the Fourth Proportional to 78,807,811.20, 118,211,716.80 and 71,155,060.80

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Solution

The fourth proportional to 78,807,811.20, 118,211,716.80 and 71,155,060.80 is: 106,732,591.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,807,811.20 : 118,211,716.80 = 71,155,060.80 : x
  2. Step 2: Convert to fraction form
    78,807,811.20/118,211,716.80 = 71,155,060.80/x
  3. Step 3: Cross multiply
    78,807,811.20x = 118,211,716.80 × 71,155,060.80
  4. Step 4: Simplify right side
    78,807,811.20x = 8,411,361,896,176,381
  5. Step 5: Solve for x
    x = 8,411,361,896,176,381/78,807,811.20
  6. Step 6: Final answer
    x = 106,732,591.20

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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.