Home / 129,706.79-178,968.11-78,746.31

Finding the Fourth Proportional to 129,706.79, 178,968.11 and 78,746.31

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Solution

The fourth proportional to 129,706.79, 178,968.11 and 78,746.31 is: 108,653.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,706.79 : 178,968.11 = 78,746.31 : x
  2. Step 2: Convert to fraction form
    129,706.79/178,968.11 = 78,746.31/x
  3. Step 3: Cross multiply
    129,706.79x = 178,968.11 × 78,746.31
  4. Step 4: Simplify right side
    129,706.79x = 14,093,077,876.44
  5. Step 5: Solve for x
    x = 14,093,077,876.44/129,706.79
  6. Step 6: Final answer
    x = 108,653.36

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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.