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Finding the Fourth Proportional to 128,453.84, 177,260.85 and 71,087.80

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Solution

The fourth proportional to 128,453.84, 177,260.85 and 71,087.80 is: 98,098.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,453.84 : 177,260.85 = 71,087.80 : x
  2. Step 2: Convert to fraction form
    128,453.84/177,260.85 = 71,087.80/x
  3. Step 3: Cross multiply
    128,453.84x = 177,260.85 × 71,087.80
  4. Step 4: Simplify right side
    128,453.84x = 12,601,083,852.63
  5. Step 5: Solve for x
    x = 12,601,083,852.63/128,453.84
  6. Step 6: Final answer
    x = 98,098.15

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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.