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Finding the Fourth Proportional to 121,899.70, 182,493.15 and 86,907.70

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Solution

The fourth proportional to 121,899.70, 182,493.15 and 86,907.70 is: 130,107.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,899.70 : 182,493.15 = 86,907.70 : x
  2. Step 2: Convert to fraction form
    121,899.70/182,493.15 = 86,907.70/x
  3. Step 3: Cross multiply
    121,899.70x = 182,493.15 × 86,907.70
  4. Step 4: Simplify right side
    121,899.70x = 15,860,059,932.26
  5. Step 5: Solve for x
    x = 15,860,059,932.26/121,899.70
  6. Step 6: Final answer
    x = 130,107.46

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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.