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Finding the Fourth Proportional to 100,354.90, 138,489.94 and 55,033.21

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Solution

The fourth proportional to 100,354.90, 138,489.94 and 55,033.21 is: 75,945.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,354.90 : 138,489.94 = 55,033.21 : x
  2. Step 2: Convert to fraction form
    100,354.90/138,489.94 = 55,033.21/x
  3. Step 3: Cross multiply
    100,354.90x = 138,489.94 × 55,033.21
  4. Step 4: Simplify right side
    100,354.90x = 7,621,545,689.26
  5. Step 5: Solve for x
    x = 7,621,545,689.26/100,354.90
  6. Step 6: Final answer
    x = 75,945.92

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1.5x scale

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.