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Finding the Fourth Proportional to 128,367.27, 177,133.19 and 70,997.47

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Solution

The fourth proportional to 128,367.27, 177,133.19 and 70,997.47 is: 97,968.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,367.27 : 177,133.19 = 70,997.47 : x
  2. Step 2: Convert to fraction form
    128,367.27/177,133.19 = 70,997.47/x
  3. Step 3: Cross multiply
    128,367.27x = 177,133.19 × 70,997.47
  4. Step 4: Simplify right side
    128,367.27x = 12,576,008,343.03
  5. Step 5: Solve for x
    x = 12,576,008,343.03/128,367.27
  6. Step 6: Final answer
    x = 97,968.97

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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.