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Finding the Fourth Proportional to 128,257.62, 176,998.44 and 71,668.86

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Solution

The fourth proportional to 128,257.62, 176,998.44 and 71,668.86 is: 98,904.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,257.62 : 176,998.44 = 71,668.86 : x
  2. Step 2: Convert to fraction form
    128,257.62/176,998.44 = 71,668.86/x
  3. Step 3: Cross multiply
    128,257.62x = 176,998.44 × 71,668.86
  4. Step 4: Simplify right side
    128,257.62x = 12,685,276,416.58
  5. Step 5: Solve for x
    x = 12,685,276,416.58/128,257.62
  6. Step 6: Final answer
    x = 98,904.66

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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.