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Finding the Fourth Proportional to 426,190.56, 639,389.84 and 141,880.64

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Solution

The fourth proportional to 426,190.56, 639,389.84 and 141,880.64 is: 212,855.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,190.56 : 639,389.84 = 141,880.64 : x
  2. Step 2: Convert to fraction form
    426,190.56/639,389.84 = 141,880.64/x
  3. Step 3: Cross multiply
    426,190.56x = 639,389.84 × 141,880.64
  4. Step 4: Simplify right side
    426,190.56x = 90,717,039,708.70
  5. Step 5: Solve for x
    x = 90,717,039,708.70/426,190.56
  6. Step 6: Final answer
    x = 212,855.58

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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.