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Finding the Fourth Proportional to 86,715.90, 121,664.70 and 86,715.90

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Solution

The fourth proportional to 86,715.90, 121,664.70 and 86,715.90 is: 121,664.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,715.90 : 121,664.70 = 86,715.90 : x
  2. Step 2: Convert to fraction form
    86,715.90/121,664.70 = 86,715.90/x
  3. Step 3: Cross multiply
    86,715.90x = 121,664.70 × 86,715.90
  4. Step 4: Simplify right side
    86,715.90x = 10,550,263,958.73
  5. Step 5: Solve for x
    x = 10,550,263,958.73/86,715.90
  6. Step 6: Final answer
    x = 121,664.70

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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.