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Finding the Fourth Proportional to 72,564,991.20, 108,889,477.20 and 27,131,378.40

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Solution

The fourth proportional to 72,564,991.20, 108,889,477.20 and 27,131,378.40 is: 40,712,767.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,564,991.20 : 108,889,477.20 = 27,131,378.40 : x
  2. Step 2: Convert to fraction form
    72,564,991.20/108,889,477.20 = 27,131,378.40/x
  3. Step 3: Cross multiply
    72,564,991.20x = 108,889,477.20 × 27,131,378.40
  4. Step 4: Simplify right side
    72,564,991.20x = 2,954,321,609,691,372.50
  5. Step 5: Solve for x
    x = 2,954,321,609,691,372.50/72,564,991.20
  6. Step 6: Final answer
    x = 40,712,767.42

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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.