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Finding the Fourth Proportional to 128,379.92, 177,150.65 and 71,010.15

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Solution

The fourth proportional to 128,379.92, 177,150.65 and 71,010.15 is: 97,986.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,379.92 : 177,150.65 = 71,010.15 : x
  2. Step 2: Convert to fraction form
    128,379.92/177,150.65 = 71,010.15/x
  3. Step 3: Cross multiply
    128,379.92x = 177,150.65 × 71,010.15
  4. Step 4: Simplify right side
    128,379.92x = 12,579,493,874.05
  5. Step 5: Solve for x
    x = 12,579,493,874.05/128,379.92
  6. Step 6: Final answer
    x = 97,986.46

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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.