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Finding the Fourth Proportional to 838.65, 1,157.49 and 629.88

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Solution

The fourth proportional to 838.65, 1,157.49 and 629.88 is: 869.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.65 : 1,157.49 = 629.88 : x
  2. Step 2: Convert to fraction form
    838.65/1,157.49 = 629.88/x
  3. Step 3: Cross multiply
    838.65x = 1,157.49 × 629.88
  4. Step 4: Simplify right side
    838.65x = 729,075.46
  5. Step 5: Solve for x
    x = 729,075.46/838.65
  6. Step 6: Final answer
    x = 869.34

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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.