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Finding the Fourth Proportional to 100,492.96, 138,674.05 and 55,170.66

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Solution

The fourth proportional to 100,492.96, 138,674.05 and 55,170.66 is: 76,132.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,492.96 : 138,674.05 = 55,170.66 : x
  2. Step 2: Convert to fraction form
    100,492.96/138,674.05 = 55,170.66/x
  3. Step 3: Cross multiply
    100,492.96x = 138,674.05 × 55,170.66
  4. Step 4: Simplify right side
    100,492.96x = 7,650,739,477.70
  5. Step 5: Solve for x
    x = 7,650,739,477.70/100,492.96
  6. Step 6: Final answer
    x = 76,132.09

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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.