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Finding the Fourth Proportional to 121,840.72, 168,139.72 and 68,125.57

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Solution

The fourth proportional to 121,840.72, 168,139.72 and 68,125.57 is: 94,013.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,840.72 : 168,139.72 = 68,125.57 : x
  2. Step 2: Convert to fraction form
    121,840.72/168,139.72 = 68,125.57/x
  3. Step 3: Cross multiply
    121,840.72x = 168,139.72 × 68,125.57
  4. Step 4: Simplify right side
    121,840.72x = 11,454,614,264.64
  5. Step 5: Solve for x
    x = 11,454,614,264.64/121,840.72
  6. Step 6: Final answer
    x = 94,013.02

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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.