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Finding the Fourth Proportional to 86,620.40, 129,930.60 and 34,012.40

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Solution

The fourth proportional to 86,620.40, 129,930.60 and 34,012.40 is: 51,018.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,620.40 : 129,930.60 = 34,012.40 : x
  2. Step 2: Convert to fraction form
    86,620.40/129,930.60 = 34,012.40/x
  3. Step 3: Cross multiply
    86,620.40x = 129,930.60 × 34,012.40
  4. Step 4: Simplify right side
    86,620.40x = 4,419,251,539.44
  5. Step 5: Solve for x
    x = 4,419,251,539.44/86,620.40
  6. Step 6: Final answer
    x = 51,018.60

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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.