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Finding the Fourth Proportional to 1,153.14, 1,591.28 and 629.16

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Solution

The fourth proportional to 1,153.14, 1,591.28 and 629.16 is: 868.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.14 : 1,591.28 = 629.16 : x
  2. Step 2: Convert to fraction form
    1,153.14/1,591.28 = 629.16/x
  3. Step 3: Cross multiply
    1,153.14x = 1,591.28 × 629.16
  4. Step 4: Simplify right side
    1,153.14x = 1,001,169.72
  5. Step 5: Solve for x
    x = 1,001,169.72/1,153.14
  6. Step 6: Final answer
    x = 868.21

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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.