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Finding the Fourth Proportional to 753.81, 1,039.77 and 491.73

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Solution

The fourth proportional to 753.81, 1,039.77 and 491.73 is: 678.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.81 : 1,039.77 = 491.73 : x
  2. Step 2: Convert to fraction form
    753.81/1,039.77 = 491.73/x
  3. Step 3: Cross multiply
    753.81x = 1,039.77 × 491.73
  4. Step 4: Simplify right side
    753.81x = 511,286.10
  5. Step 5: Solve for x
    x = 511,286.10/753.81
  6. Step 6: Final answer
    x = 678.27

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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.