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Finding the Fourth Proportional to 128,889.88, 178,187.70 and 127,708.36

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Solution

The fourth proportional to 128,889.88, 178,187.70 and 127,708.36 is: 176,554.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,889.88 : 178,187.70 = 127,708.36 : x
  2. Step 2: Convert to fraction form
    128,889.88/178,187.70 = 127,708.36/x
  3. Step 3: Cross multiply
    128,889.88x = 178,187.70 × 127,708.36
  4. Step 4: Simplify right side
    128,889.88x = 22,756,058,939.17
  5. Step 5: Solve for x
    x = 22,756,058,939.17/128,889.88
  6. Step 6: Final answer
    x = 176,554.27

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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.