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Finding the Fourth Proportional to 431,245.80, 646,868.70 and 135,719.40

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Solution

The fourth proportional to 431,245.80, 646,868.70 and 135,719.40 is: 203,579.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,245.80 : 646,868.70 = 135,719.40 : x
  2. Step 2: Convert to fraction form
    431,245.80/646,868.70 = 135,719.40/x
  3. Step 3: Cross multiply
    431,245.80x = 646,868.70 × 135,719.40
  4. Step 4: Simplify right side
    431,245.80x = 87,792,631,842.78
  5. Step 5: Solve for x
    x = 87,792,631,842.78/431,245.80
  6. Step 6: Final answer
    x = 203,579.10

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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.