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Finding the Fourth Proportional to 128,608.40, 177,475.46 and 71,245.38

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Solution

The fourth proportional to 128,608.40, 177,475.46 and 71,245.38 is: 98,316.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,608.40 : 177,475.46 = 71,245.38 : x
  2. Step 2: Convert to fraction form
    128,608.40/177,475.46 = 71,245.38/x
  3. Step 3: Cross multiply
    128,608.40x = 177,475.46 × 71,245.38
  4. Step 4: Simplify right side
    128,608.40x = 12,644,306,588.37
  5. Step 5: Solve for x
    x = 12,644,306,588.37/128,608.40
  6. Step 6: Final answer
    x = 98,316.34

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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.