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Finding the Fourth Proportional to 100,650.10, 138,881.92 and 55,330

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Solution

The fourth proportional to 100,650.10, 138,881.92 and 55,330 is: 76,347.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,650.10 : 138,881.92 = 55,330 : x
  2. Step 2: Convert to fraction form
    100,650.10/138,881.92 = 55,330/x
  3. Step 3: Cross multiply
    100,650.10x = 138,881.92 × 55,330
  4. Step 4: Simplify right side
    100,650.10x = 7,684,336,633.60
  5. Step 5: Solve for x
    x = 7,684,336,633.60/100,650.10
  6. Step 6: Final answer
    x = 76,347.03

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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.