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Finding the Fourth Proportional to 428,891.16, 642,319.79 and 339,858.39

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Solution

The fourth proportional to 428,891.16, 642,319.79 and 339,858.39 is: 508,981.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,891.16 : 642,319.79 = 339,858.39 : x
  2. Step 2: Convert to fraction form
    428,891.16/642,319.79 = 339,858.39/x
  3. Step 3: Cross multiply
    428,891.16x = 642,319.79 × 339,858.39
  4. Step 4: Simplify right side
    428,891.16x = 218,297,767,995.25
  5. Step 5: Solve for x
    x = 218,297,767,995.25/428,891.16
  6. Step 6: Final answer
    x = 508,981.74

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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.