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Finding the Fourth Proportional to 128,708.15, 177,511.92 and 90,593.87

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Solution

The fourth proportional to 128,708.15, 177,511.92 and 90,593.87 is: 124,945.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.15 : 177,511.92 = 90,593.87 : x
  2. Step 2: Convert to fraction form
    128,708.15/177,511.92 = 90,593.87/x
  3. Step 3: Cross multiply
    128,708.15x = 177,511.92 × 90,593.87
  4. Step 4: Simplify right side
    128,708.15x = 16,081,490,916.37
  5. Step 5: Solve for x
    x = 16,081,490,916.37/128,708.15
  6. Step 6: Final answer
    x = 124,945.40

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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.