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Finding the Fourth Proportional to 128,432.22, 177,243.35 and 71,840.22

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Solution

The fourth proportional to 128,432.22, 177,243.35 and 71,840.22 is: 99,143.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,432.22 : 177,243.35 = 71,840.22 : x
  2. Step 2: Convert to fraction form
    128,432.22/177,243.35 = 71,840.22/x
  3. Step 3: Cross multiply
    128,432.22x = 177,243.35 × 71,840.22
  4. Step 4: Simplify right side
    128,432.22x = 12,733,201,257.54
  5. Step 5: Solve for x
    x = 12,733,201,257.54/128,432.22
  6. Step 6: Final answer
    x = 99,143.36

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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.