Home / 121,839.72-168,138.34-68,124.57

Finding the Fourth Proportional to 121,839.72, 168,138.34 and 68,124.57

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Solution

The fourth proportional to 121,839.72, 168,138.34 and 68,124.57 is: 94,011.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,839.72 : 168,138.34 = 68,124.57 : x
  2. Step 2: Convert to fraction form
    121,839.72/168,138.34 = 68,124.57/x
  3. Step 3: Cross multiply
    121,839.72x = 168,138.34 × 68,124.57
  4. Step 4: Simplify right side
    121,839.72x = 11,454,352,113.01
  5. Step 5: Solve for x
    x = 11,454,352,113.01/121,839.72
  6. Step 6: Final answer
    x = 94,011.64

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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.