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Finding the Fourth Proportional to 755.15, 1,042.16 and 440.49

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Solution

The fourth proportional to 755.15, 1,042.16 and 440.49 is: 607.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.15 : 1,042.16 = 440.49 : x
  2. Step 2: Convert to fraction form
    755.15/1,042.16 = 440.49/x
  3. Step 3: Cross multiply
    755.15x = 1,042.16 × 440.49
  4. Step 4: Simplify right side
    755.15x = 459,061.06
  5. Step 5: Solve for x
    x = 459,061.06/755.15
  6. Step 6: Final answer
    x = 607.91

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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.