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Finding the Fourth Proportional to 86,780.40, 130,170.60 and 80,559.60

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Solution

The fourth proportional to 86,780.40, 130,170.60 and 80,559.60 is: 120,839.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,780.40 : 130,170.60 = 80,559.60 : x
  2. Step 2: Convert to fraction form
    86,780.40/130,170.60 = 80,559.60/x
  3. Step 3: Cross multiply
    86,780.40x = 130,170.60 × 80,559.60
  4. Step 4: Simplify right side
    86,780.40x = 10,486,491,467.76
  5. Step 5: Solve for x
    x = 10,486,491,467.76/86,780.40
  6. Step 6: Final answer
    x = 120,839.40

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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.