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Finding the Fourth Proportional to 155,634.80, 214,737 and 87,638

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Solution

The fourth proportional to 155,634.80, 214,737 and 87,638 is: 120,918.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,634.80 : 214,737 = 87,638 : x
  2. Step 2: Convert to fraction form
    155,634.80/214,737 = 87,638/x
  3. Step 3: Cross multiply
    155,634.80x = 214,737 × 87,638
  4. Step 4: Simplify right side
    155,634.80x = 18,819,121,206
  5. Step 5: Solve for x
    x = 18,819,121,206/155,634.80
  6. Step 6: Final answer
    x = 120,918.47

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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.