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Finding the Fourth Proportional to 128,469.65, 177,288.35 and 71,112.94

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Solution

The fourth proportional to 128,469.65, 177,288.35 and 71,112.94 is: 98,135.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,469.65 : 177,288.35 = 71,112.94 : x
  2. Step 2: Convert to fraction form
    128,469.65/177,288.35 = 71,112.94/x
  3. Step 3: Cross multiply
    128,469.65x = 177,288.35 × 71,112.94
  4. Step 4: Simplify right side
    128,469.65x = 12,607,494,997.46
  5. Step 5: Solve for x
    x = 12,607,494,997.46/128,469.65
  6. Step 6: Final answer
    x = 98,135.98

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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.