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Finding the Fourth Proportional to 755.56, 1,042.74 and 445

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Solution

The fourth proportional to 755.56, 1,042.74 and 445 is: 614.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.56 : 1,042.74 = 445 : x
  2. Step 2: Convert to fraction form
    755.56/1,042.74 = 445/x
  3. Step 3: Cross multiply
    755.56x = 1,042.74 × 445
  4. Step 4: Simplify right side
    755.56x = 464,019.30
  5. Step 5: Solve for x
    x = 464,019.30/755.56
  6. Step 6: Final answer
    x = 614.14

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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.