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Finding the Fourth Proportional to 128,415.69, 177,204.02 and 71,816.13

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Solution

The fourth proportional to 128,415.69, 177,204.02 and 71,816.13 is: 99,100.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,415.69 : 177,204.02 = 71,816.13 : x
  2. Step 2: Convert to fraction form
    128,415.69/177,204.02 = 71,816.13/x
  3. Step 3: Cross multiply
    128,415.69x = 177,204.02 × 71,816.13
  4. Step 4: Simplify right side
    128,415.69x = 12,726,106,936.84
  5. Step 5: Solve for x
    x = 12,726,106,936.84/128,415.69
  6. Step 6: Final answer
    x = 99,100.87

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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.