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Finding the Fourth Proportional to 128,659.44, 177,455.16 and 88,379.76

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Solution

The fourth proportional to 128,659.44, 177,455.16 and 88,379.76 is: 121,898.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,659.44 : 177,455.16 = 88,379.76 : x
  2. Step 2: Convert to fraction form
    128,659.44/177,455.16 = 88,379.76/x
  3. Step 3: Cross multiply
    128,659.44x = 177,455.16 × 88,379.76
  4. Step 4: Simplify right side
    128,659.44x = 15,683,444,451.56
  5. Step 5: Solve for x
    x = 15,683,444,451.56/128,659.44
  6. Step 6: Final answer
    x = 121,898.90

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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.