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Finding the Fourth Proportional to 61,169,957.60, 91,754,936.40 and 20,780,441.60

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Solution

The fourth proportional to 61,169,957.60, 91,754,936.40 and 20,780,441.60 is: 31,170,662.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,169,957.60 : 91,754,936.40 = 20,780,441.60 : x
  2. Step 2: Convert to fraction form
    61,169,957.60/91,754,936.40 = 20,780,441.60/x
  3. Step 3: Cross multiply
    61,169,957.60x = 91,754,936.40 × 20,780,441.60
  4. Step 4: Simplify right side
    61,169,957.60x = 1,906,708,097,371,914.50
  5. Step 5: Solve for x
    x = 1,906,708,097,371,914.50/61,169,957.60
  6. Step 6: Final answer
    x = 31,170,662.40

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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.