Home / 128,921.49-177,908.87-71,557.45

Finding the Fourth Proportional to 128,921.49, 177,908.87 and 71,557.45

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Solution

The fourth proportional to 128,921.49, 177,908.87 and 71,557.45 is: 98,747.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,921.49 : 177,908.87 = 71,557.45 : x
  2. Step 2: Convert to fraction form
    128,921.49/177,908.87 = 71,557.45/x
  3. Step 3: Cross multiply
    128,921.49x = 177,908.87 × 71,557.45
  4. Step 4: Simplify right side
    128,921.49x = 12,730,704,803.70
  5. Step 5: Solve for x
    x = 12,730,704,803.70/128,921.49
  6. Step 6: Final answer
    x = 98,747.73

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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.