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Finding the Fourth Proportional to 128,930.82, 177,927.60 and 72,346.38

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Solution

The fourth proportional to 128,930.82, 177,927.60 and 72,346.38 is: 99,839.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,930.82 : 177,927.60 = 72,346.38 : x
  2. Step 2: Convert to fraction form
    128,930.82/177,927.60 = 72,346.38/x
  3. Step 3: Cross multiply
    128,930.82x = 177,927.60 × 72,346.38
  4. Step 4: Simplify right side
    128,930.82x = 12,872,417,762.09
  5. Step 5: Solve for x
    x = 12,872,417,762.09/128,930.82
  6. Step 6: Final answer
    x = 99,839.73

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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.