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Finding the Fourth Proportional to 755.68, 1,042.40 and 445.12

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Solution

The fourth proportional to 755.68, 1,042.40 and 445.12 is: 614.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.68 : 1,042.40 = 445.12 : x
  2. Step 2: Convert to fraction form
    755.68/1,042.40 = 445.12/x
  3. Step 3: Cross multiply
    755.68x = 1,042.40 × 445.12
  4. Step 4: Simplify right side
    755.68x = 463,993.09
  5. Step 5: Solve for x
    x = 463,993.09/755.68
  6. Step 6: Final answer
    x = 614.01

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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.