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Finding the Fourth Proportional to 128,281.69, 177,029 and 71,693.07

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Solution

The fourth proportional to 128,281.69, 177,029 and 71,693.07 is: 98,936.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,281.69 : 177,029 = 71,693.07 : x
  2. Step 2: Convert to fraction form
    128,281.69/177,029 = 71,693.07/x
  3. Step 3: Cross multiply
    128,281.69x = 177,029 × 71,693.07
  4. Step 4: Simplify right side
    128,281.69x = 12,691,752,489.03
  5. Step 5: Solve for x
    x = 12,691,752,489.03/128,281.69
  6. Step 6: Final answer
    x = 98,936.59

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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.