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Finding the Fourth Proportional to 121,679.40, 182,907.90 and 86,860.20

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Solution

The fourth proportional to 121,679.40, 182,907.90 and 86,860.20 is: 130,567.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,679.40 : 182,907.90 = 86,860.20 : x
  2. Step 2: Convert to fraction form
    121,679.40/182,907.90 = 86,860.20/x
  3. Step 3: Cross multiply
    121,679.40x = 182,907.90 × 86,860.20
  4. Step 4: Simplify right side
    121,679.40x = 15,887,416,775.58
  5. Step 5: Solve for x
    x = 15,887,416,775.58/121,679.40
  6. Step 6: Final answer
    x = 130,567.84

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1.5x scale

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.