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Finding the Fourth Proportional to 85,877,928.80, 128,816,893.20 and 68,871,816.80

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Solution

The fourth proportional to 85,877,928.80, 128,816,893.20 and 68,871,816.80 is: 103,307,725.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,877,928.80 : 128,816,893.20 = 68,871,816.80 : x
  2. Step 2: Convert to fraction form
    85,877,928.80/128,816,893.20 = 68,871,816.80/x
  3. Step 3: Cross multiply
    85,877,928.80x = 128,816,893.20 × 68,871,816.80
  4. Step 4: Simplify right side
    85,877,928.80x = 8,871,853,469,215,566
  5. Step 5: Solve for x
    x = 8,871,853,469,215,566/85,877,928.80
  6. Step 6: Final answer
    x = 103,307,725.20

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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.