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Finding the Fourth Proportional to 86,513.60, 129,770.40 and 66,830.60

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Solution

The fourth proportional to 86,513.60, 129,770.40 and 66,830.60 is: 100,245.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,513.60 : 129,770.40 = 66,830.60 : x
  2. Step 2: Convert to fraction form
    86,513.60/129,770.40 = 66,830.60/x
  3. Step 3: Cross multiply
    86,513.60x = 129,770.40 × 66,830.60
  4. Step 4: Simplify right side
    86,513.60x = 8,672,633,694.24
  5. Step 5: Solve for x
    x = 8,672,633,694.24/86,513.60
  6. Step 6: Final answer
    x = 100,245.90

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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.