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Finding the Fourth Proportional to 121,670.36, 167,988.11 and 78,753.72

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Solution

The fourth proportional to 121,670.36, 167,988.11 and 78,753.72 is: 108,733.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,670.36 : 167,988.11 = 78,753.72 : x
  2. Step 2: Convert to fraction form
    121,670.36/167,988.11 = 78,753.72/x
  3. Step 3: Cross multiply
    121,670.36x = 167,988.11 × 78,753.72
  4. Step 4: Simplify right side
    121,670.36x = 13,229,688,184.50
  5. Step 5: Solve for x
    x = 13,229,688,184.50/121,670.36
  6. Step 6: Final answer
    x = 108,733.87

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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.