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Finding the Fourth Proportional to 768.81, 1,061.05 and 454.21

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Solution

The fourth proportional to 768.81, 1,061.05 and 454.21 is: 626.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.81 : 1,061.05 = 454.21 : x
  2. Step 2: Convert to fraction form
    768.81/1,061.05 = 454.21/x
  3. Step 3: Cross multiply
    768.81x = 1,061.05 × 454.21
  4. Step 4: Simplify right side
    768.81x = 481,936.58
  5. Step 5: Solve for x
    x = 481,936.58/768.81
  6. Step 6: Final answer
    x = 626.86

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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.