Home / 129,078.36-178,117.56-71,719.43

Finding the Fourth Proportional to 129,078.36, 178,117.56 and 71,719.43

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Solution

The fourth proportional to 129,078.36, 178,117.56 and 71,719.43 is: 98,966.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,078.36 : 178,117.56 = 71,719.43 : x
  2. Step 2: Convert to fraction form
    129,078.36/178,117.56 = 71,719.43/x
  3. Step 3: Cross multiply
    129,078.36x = 178,117.56 × 71,719.43
  4. Step 4: Simplify right side
    129,078.36x = 12,774,488,985.60
  5. Step 5: Solve for x
    x = 12,774,488,985.60/129,078.36
  6. Step 6: Final answer
    x = 98,966.93

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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.