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Finding the Fourth Proportional to 86,906,661.20, 130,359,991.80 and 39,130,917.20

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Solution

The fourth proportional to 86,906,661.20, 130,359,991.80 and 39,130,917.20 is: 58,696,375.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,906,661.20 : 130,359,991.80 = 39,130,917.20 : x
  2. Step 2: Convert to fraction form
    86,906,661.20/130,359,991.80 = 39,130,917.20/x
  3. Step 3: Cross multiply
    86,906,661.20x = 130,359,991.80 × 39,130,917.20
  4. Step 4: Simplify right side
    86,906,661.20x = 5,101,106,045,318,479
  5. Step 5: Solve for x
    x = 5,101,106,045,318,479/86,906,661.20
  6. Step 6: Final answer
    x = 58,696,375.80

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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.