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Finding the Fourth Proportional to 755, 1,042.06 and 479.16

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Solution

The fourth proportional to 755, 1,042.06 and 479.16 is: 661.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    755 : 1,042.06 = 479.16 : x
  2. Step 2: Convert to fraction form
    755/1,042.06 = 479.16/x
  3. Step 3: Cross multiply
    755x = 1,042.06 × 479.16
  4. Step 4: Simplify right side
    755x = 499,313.47
  5. Step 5: Solve for x
    x = 499,313.47/755
  6. Step 6: Final answer
    x = 661.34

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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.