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Finding the Fourth Proportional to 77,310.30, 115,965.45 and 68,999.70

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Solution

The fourth proportional to 77,310.30, 115,965.45 and 68,999.70 is: 103,499.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,310.30 : 115,965.45 = 68,999.70 : x
  2. Step 2: Convert to fraction form
    77,310.30/115,965.45 = 68,999.70/x
  3. Step 3: Cross multiply
    77,310.30x = 115,965.45 × 68,999.70
  4. Step 4: Simplify right side
    77,310.30x = 8,001,581,260.37
  5. Step 5: Solve for x
    x = 8,001,581,260.37/77,310.30
  6. Step 6: Final answer
    x = 103,499.55

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Similar ratio
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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.