Home / 128,698.08-192,915.90-78,747

Finding the Fourth Proportional to 128,698.08, 192,915.90 and 78,747

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Solution

The fourth proportional to 128,698.08, 192,915.90 and 78,747 is: 118,040.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,698.08 : 192,915.90 = 78,747 : x
  2. Step 2: Convert to fraction form
    128,698.08/192,915.90 = 78,747/x
  3. Step 3: Cross multiply
    128,698.08x = 192,915.90 × 78,747
  4. Step 4: Simplify right side
    128,698.08x = 15,191,548,377.30
  5. Step 5: Solve for x
    x = 15,191,548,377.30/128,698.08
  6. Step 6: Final answer
    x = 118,040.21

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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.