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Finding the Fourth Proportional to 128,390.49, 177,143.34 and 73,940.40

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Solution

The fourth proportional to 128,390.49, 177,143.34 and 73,940.40 is: 102,017.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,390.49 : 177,143.34 = 73,940.40 : x
  2. Step 2: Convert to fraction form
    128,390.49/177,143.34 = 73,940.40/x
  3. Step 3: Cross multiply
    128,390.49x = 177,143.34 × 73,940.40
  4. Step 4: Simplify right side
    128,390.49x = 13,098,049,416.94
  5. Step 5: Solve for x
    x = 13,098,049,416.94/128,390.49
  6. Step 6: Final answer
    x = 102,017.29

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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.