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Finding the Fourth Proportional to 100,435.64, 138,603 and 55,118.04

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Solution

The fourth proportional to 100,435.64, 138,603 and 55,118.04 is: 76,063.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,435.64 : 138,603 = 55,118.04 : x
  2. Step 2: Convert to fraction form
    100,435.64/138,603 = 55,118.04/x
  3. Step 3: Cross multiply
    100,435.64x = 138,603 × 55,118.04
  4. Step 4: Simplify right side
    100,435.64x = 7,639,525,698.12
  5. Step 5: Solve for x
    x = 7,639,525,698.12/100,435.64
  6. Step 6: Final answer
    x = 76,063.89

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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.