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Finding the Fourth Proportional to 86,008.40, 129,012.60 and 80,824.40

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Solution

The fourth proportional to 86,008.40, 129,012.60 and 80,824.40 is: 121,236.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,008.40 : 129,012.60 = 80,824.40 : x
  2. Step 2: Convert to fraction form
    86,008.40/129,012.60 = 80,824.40/x
  3. Step 3: Cross multiply
    86,008.40x = 129,012.60 × 80,824.40
  4. Step 4: Simplify right side
    86,008.40x = 10,427,365,987.44
  5. Step 5: Solve for x
    x = 10,427,365,987.44/86,008.40
  6. Step 6: Final answer
    x = 121,236.60

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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.