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Finding the Fourth Proportional to 755.45, 1,042.55 and 475.65

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Solution

The fourth proportional to 755.45, 1,042.55 and 475.65 is: 656.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.45 : 1,042.55 = 475.65 : x
  2. Step 2: Convert to fraction form
    755.45/1,042.55 = 475.65/x
  3. Step 3: Cross multiply
    755.45x = 1,042.55 × 475.65
  4. Step 4: Simplify right side
    755.45x = 495,888.91
  5. Step 5: Solve for x
    x = 495,888.91/755.45
  6. Step 6: Final answer
    x = 656.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.