Home / 129,128.36-178,180.56-75,374.48

Finding the Fourth Proportional to 129,128.36, 178,180.56 and 75,374.48

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Solution

The fourth proportional to 129,128.36, 178,180.56 and 75,374.48 is: 104,007.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,128.36 : 178,180.56 = 75,374.48 : x
  2. Step 2: Convert to fraction form
    129,128.36/178,180.56 = 75,374.48/x
  3. Step 3: Cross multiply
    129,128.36x = 178,180.56 × 75,374.48
  4. Step 4: Simplify right side
    129,128.36x = 13,430,267,056.11
  5. Step 5: Solve for x
    x = 13,430,267,056.11/129,128.36
  6. Step 6: Final answer
    x = 104,007.11

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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.