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Finding the Fourth Proportional to 72,719,999.80, 109,079,999.70 and 34,456,247.80

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Solution

The fourth proportional to 72,719,999.80, 109,079,999.70 and 34,456,247.80 is: 51,684,371.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,719,999.80 : 109,079,999.70 = 34,456,247.80 : x
  2. Step 2: Convert to fraction form
    72,719,999.80/109,079,999.70 = 34,456,247.80/x
  3. Step 3: Cross multiply
    72,719,999.80x = 109,079,999.70 × 34,456,247.80
  4. Step 4: Simplify right side
    72,719,999.80x = 3,758,487,499,687,125.50
  5. Step 5: Solve for x
    x = 3,758,487,499,687,125.50/72,719,999.80
  6. Step 6: Final answer
    x = 51,684,371.70

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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.