Home / 78,725.75-118,107.05-31,343.72

Finding the Fourth Proportional to 78,725.75, 118,107.05 and 31,343.72

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Solution

The fourth proportional to 78,725.75, 118,107.05 and 31,343.72 is: 47,022.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,725.75 : 118,107.05 = 31,343.72 : x
  2. Step 2: Convert to fraction form
    78,725.75/118,107.05 = 31,343.72/x
  3. Step 3: Cross multiply
    78,725.75x = 118,107.05 × 31,343.72
  4. Step 4: Simplify right side
    78,725.75x = 3,701,913,557.97
  5. Step 5: Solve for x
    x = 3,701,913,557.97/78,725.75
  6. Step 6: Final answer
    x = 47,022.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.