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Finding the Fourth Proportional to 129,866.40, 194,665.20 and 70,576.80

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Solution

The fourth proportional to 129,866.40, 194,665.20 and 70,576.80 is: 105,792.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,866.40 : 194,665.20 = 70,576.80 : x
  2. Step 2: Convert to fraction form
    129,866.40/194,665.20 = 70,576.80/x
  3. Step 3: Cross multiply
    129,866.40x = 194,665.20 × 70,576.80
  4. Step 4: Simplify right side
    129,866.40x = 13,738,846,887.36
  5. Step 5: Solve for x
    x = 13,738,846,887.36/129,866.40
  6. Step 6: Final answer
    x = 105,792.16

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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.