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Finding the Fourth Proportional to 128,369.70, 177,136.55 and 70,999.91

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Solution

The fourth proportional to 128,369.70, 177,136.55 and 70,999.91 is: 97,972.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,369.70 : 177,136.55 = 70,999.91 : x
  2. Step 2: Convert to fraction form
    128,369.70/177,136.55 = 70,999.91/x
  3. Step 3: Cross multiply
    128,369.70x = 177,136.55 × 70,999.91
  4. Step 4: Simplify right side
    128,369.70x = 12,576,678,797.54
  5. Step 5: Solve for x
    x = 12,576,678,797.54/128,369.70
  6. Step 6: Final answer
    x = 97,972.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.