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Finding the Fourth Proportional to 128,071.56, 176,733.06 and 71,481.64

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Solution

The fourth proportional to 128,071.56, 176,733.06 and 71,481.64 is: 98,641.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,071.56 : 176,733.06 = 71,481.64 : x
  2. Step 2: Convert to fraction form
    128,071.56/176,733.06 = 71,481.64/x
  3. Step 3: Cross multiply
    128,071.56x = 176,733.06 × 71,481.64
  4. Step 4: Simplify right side
    128,071.56x = 12,633,168,971.02
  5. Step 5: Solve for x
    x = 12,633,168,971.02/128,071.56
  6. Step 6: Final answer
    x = 98,641.49

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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.