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Finding the Fourth Proportional to 78,560.70, 117,711.45 and 66,896.70

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Solution

The fourth proportional to 78,560.70, 117,711.45 and 66,896.70 is: 100,234.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,560.70 : 117,711.45 = 66,896.70 : x
  2. Step 2: Convert to fraction form
    78,560.70/117,711.45 = 66,896.70/x
  3. Step 3: Cross multiply
    78,560.70x = 117,711.45 × 66,896.70
  4. Step 4: Simplify right side
    78,560.70x = 7,874,507,557.22
  5. Step 5: Solve for x
    x = 7,874,507,557.22/78,560.70
  6. Step 6: Final answer
    x = 100,234.69

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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.