Home / 128,905.41-177,886.78-71,541.39

Finding the Fourth Proportional to 128,905.41, 177,886.78 and 71,541.39

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Solution

The fourth proportional to 128,905.41, 177,886.78 and 71,541.39 is: 98,725.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,905.41 : 177,886.78 = 71,541.39 : x
  2. Step 2: Convert to fraction form
    128,905.41/177,886.78 = 71,541.39/x
  3. Step 3: Cross multiply
    128,905.41x = 177,886.78 × 71,541.39
  4. Step 4: Simplify right side
    128,905.41x = 12,726,267,503.82
  5. Step 5: Solve for x
    x = 12,726,267,503.82/128,905.41
  6. Step 6: Final answer
    x = 98,725.63

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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.