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Finding the Fourth Proportional to 86,918.10, 121,860.30 and 86,918.10

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Solution

The fourth proportional to 86,918.10, 121,860.30 and 86,918.10 is: 121,860.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,918.10 : 121,860.30 = 86,918.10 : x
  2. Step 2: Convert to fraction form
    86,918.10/121,860.30 = 86,918.10/x
  3. Step 3: Cross multiply
    86,918.10x = 121,860.30 × 86,918.10
  4. Step 4: Simplify right side
    86,918.10x = 10,591,865,741.43
  5. Step 5: Solve for x
    x = 10,591,865,741.43/86,918.10
  6. Step 6: Final answer
    x = 121,860.30

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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.