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Finding the Fourth Proportional to 402,126.40, 603,170.40 and 135,860.80

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Solution

The fourth proportional to 402,126.40, 603,170.40 and 135,860.80 is: 203,784.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,126.40 : 603,170.40 = 135,860.80 : x
  2. Step 2: Convert to fraction form
    402,126.40/603,170.40 = 135,860.80/x
  3. Step 3: Cross multiply
    402,126.40x = 603,170.40 × 135,860.80
  4. Step 4: Simplify right side
    402,126.40x = 81,947,213,080.32
  5. Step 5: Solve for x
    x = 81,947,213,080.32/402,126.40
  6. Step 6: Final answer
    x = 203,784.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.