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Finding the Fourth Proportional to 86,921,568.90, 121,869,355.50 and 86,921,568.90

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Solution

The fourth proportional to 86,921,568.90, 121,869,355.50 and 86,921,568.90 is: 121,869,355.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,921,568.90 : 121,869,355.50 = 86,921,568.90 : x
  2. Step 2: Convert to fraction form
    86,921,568.90/121,869,355.50 = 86,921,568.90/x
  3. Step 3: Cross multiply
    86,921,568.90x = 121,869,355.50 × 86,921,568.90
  4. Step 4: Simplify right side
    86,921,568.90x = 10,593,075,580,891,844
  5. Step 5: Solve for x
    x = 10,593,075,580,891,844/86,921,568.90
  6. Step 6: Final answer
    x = 121,869,355.50

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.