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Finding the Fourth Proportional to 128,375.49, 177,144.60 and 71,005.69

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Solution

The fourth proportional to 128,375.49, 177,144.60 and 71,005.69 is: 97,980.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,375.49 : 177,144.60 = 71,005.69 : x
  2. Step 2: Convert to fraction form
    128,375.49/177,144.60 = 71,005.69/x
  3. Step 3: Cross multiply
    128,375.49x = 177,144.60 × 71,005.69
  4. Step 4: Simplify right side
    128,375.49x = 12,578,274,552.77
  5. Step 5: Solve for x
    x = 12,578,274,552.77/128,375.49
  6. Step 6: Final answer
    x = 97,980.34

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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.