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Finding the Fourth Proportional to 753.81, 1,039.94 and 505.21

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Solution

The fourth proportional to 753.81, 1,039.94 and 505.21 is: 696.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.81 : 1,039.94 = 505.21 : x
  2. Step 2: Convert to fraction form
    753.81/1,039.94 = 505.21/x
  3. Step 3: Cross multiply
    753.81x = 1,039.94 × 505.21
  4. Step 4: Simplify right side
    753.81x = 525,384.86
  5. Step 5: Solve for x
    x = 525,384.86/753.81
  6. Step 6: Final answer
    x = 696.97

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.