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Finding the Fourth Proportional to 85,877,911.05, 128,816,866.58 and 85,877,911.05

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Solution

The fourth proportional to 85,877,911.05, 128,816,866.58 and 85,877,911.05 is: 128,816,866.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,877,911.05 : 128,816,866.58 = 85,877,911.05 : x
  2. Step 2: Convert to fraction form
    85,877,911.05/128,816,866.58 = 85,877,911.05/x
  3. Step 3: Cross multiply
    85,877,911.05x = 128,816,866.58 × 85,877,911.05
  4. Step 4: Simplify right side
    85,877,911.05x = 11,062,523,409,467,568
  5. Step 5: Solve for x
    x = 11,062,523,409,467,568/85,877,911.05
  6. Step 6: Final answer
    x = 128,816,866.58

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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.