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Finding the Fourth Proportional to 72,379,216.80, 108,558,327.60 and 21,255,904.80

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Solution

The fourth proportional to 72,379,216.80, 108,558,327.60 and 21,255,904.80 is: 31,880,774.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,379,216.80 : 108,558,327.60 = 21,255,904.80 : x
  2. Step 2: Convert to fraction form
    72,379,216.80/108,558,327.60 = 21,255,904.80/x
  3. Step 3: Cross multiply
    72,379,216.80x = 108,558,327.60 × 21,255,904.80
  4. Step 4: Simplify right side
    72,379,216.80x = 2,307,505,476,712,812.50
  5. Step 5: Solve for x
    x = 2,307,505,476,712,812.50/72,379,216.80
  6. Step 6: Final answer
    x = 31,880,774.33

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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.