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Finding the Fourth Proportional to 72,482,659.50, 100,026,086.49 and 39,887,611.50

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Solution

The fourth proportional to 72,482,659.50, 100,026,086.49 and 39,887,611.50 is: 55,044,912.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,482,659.50 : 100,026,086.49 = 39,887,611.50 : x
  2. Step 2: Convert to fraction form
    72,482,659.50/100,026,086.49 = 39,887,611.50/x
  3. Step 3: Cross multiply
    72,482,659.50x = 100,026,086.49 × 39,887,611.50
  4. Step 4: Simplify right side
    72,482,659.50x = 3,989,801,677,778,518.50
  5. Step 5: Solve for x
    x = 3,989,801,677,778,518.50/72,482,659.50
  6. Step 6: Final answer
    x = 55,044,912.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.