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Finding the Fourth Proportional to 128,671.66, 177,619 and 83,388.52

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Solution

The fourth proportional to 128,671.66, 177,619 and 83,388.52 is: 115,109.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,671.66 : 177,619 = 83,388.52 : x
  2. Step 2: Convert to fraction form
    128,671.66/177,619 = 83,388.52/x
  3. Step 3: Cross multiply
    128,671.66x = 177,619 × 83,388.52
  4. Step 4: Simplify right side
    128,671.66x = 14,811,385,533.88
  5. Step 5: Solve for x
    x = 14,811,385,533.88/128,671.66
  6. Step 6: Final answer
    x = 115,109.93

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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.