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Finding the Fourth Proportional to 753.78, 1,039.78 and 454.82

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Solution

The fourth proportional to 753.78, 1,039.78 and 454.82 is: 627.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.78 : 1,039.78 = 454.82 : x
  2. Step 2: Convert to fraction form
    753.78/1,039.78 = 454.82/x
  3. Step 3: Cross multiply
    753.78x = 1,039.78 × 454.82
  4. Step 4: Simplify right side
    753.78x = 472,912.74
  5. Step 5: Solve for x
    x = 472,912.74/753.78
  6. Step 6: Final answer
    x = 627.39

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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.