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Finding the Fourth Proportional to 428,116.80, 642,175.20 and 401,872.80

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Solution

The fourth proportional to 428,116.80, 642,175.20 and 401,872.80 is: 602,809.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,116.80 : 642,175.20 = 401,872.80 : x
  2. Step 2: Convert to fraction form
    428,116.80/642,175.20 = 401,872.80/x
  3. Step 3: Cross multiply
    428,116.80x = 642,175.20 × 401,872.80
  4. Step 4: Simplify right side
    428,116.80x = 258,072,745,714.56
  5. Step 5: Solve for x
    x = 258,072,745,714.56/428,116.80
  6. Step 6: Final answer
    x = 602,809.20

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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.