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Finding the Fourth Proportional to 128,081.56, 176,746.86 and 71,491.64

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Solution

The fourth proportional to 128,081.56, 176,746.86 and 71,491.64 is: 98,655.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,081.56 : 176,746.86 = 71,491.64 : x
  2. Step 2: Convert to fraction form
    128,081.56/176,746.86 = 71,491.64/x
  3. Step 3: Cross multiply
    128,081.56x = 176,746.86 × 71,491.64
  4. Step 4: Simplify right side
    128,081.56x = 12,635,922,886.25
  5. Step 5: Solve for x
    x = 12,635,922,886.25/128,081.56
  6. Step 6: Final answer
    x = 98,655.29

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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.