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Finding the Fourth Proportional to 128,707.73, 177,419.78 and 90,359.70

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Solution

The fourth proportional to 128,707.73, 177,419.78 and 90,359.70 is: 124,558.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,707.73 : 177,419.78 = 90,359.70 : x
  2. Step 2: Convert to fraction form
    128,707.73/177,419.78 = 90,359.70/x
  3. Step 3: Cross multiply
    128,707.73x = 177,419.78 × 90,359.70
  4. Step 4: Simplify right side
    128,707.73x = 16,031,597,316.59
  5. Step 5: Solve for x
    x = 16,031,597,316.59/128,707.73
  6. Step 6: Final answer
    x = 124,558.16

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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.