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Finding the Fourth Proportional to 128,257.16, 176,994.60 and 71,668.54

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Solution

The fourth proportional to 128,257.16, 176,994.60 and 71,668.54 is: 98,902.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,257.16 : 176,994.60 = 71,668.54 : x
  2. Step 2: Convert to fraction form
    128,257.16/176,994.60 = 71,668.54/x
  3. Step 3: Cross multiply
    128,257.16x = 176,994.60 × 71,668.54
  4. Step 4: Simplify right side
    128,257.16x = 12,684,943,684.91
  5. Step 5: Solve for x
    x = 12,684,943,684.91/128,257.16
  6. Step 6: Final answer
    x = 98,902.42

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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.