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Finding the Fourth Proportional to 720.88, 1,075.52 and 629.44

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Solution

The fourth proportional to 720.88, 1,075.52 and 629.44 is: 939.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.88 : 1,075.52 = 629.44 : x
  2. Step 2: Convert to fraction form
    720.88/1,075.52 = 629.44/x
  3. Step 3: Cross multiply
    720.88x = 1,075.52 × 629.44
  4. Step 4: Simplify right side
    720.88x = 676,975.31
  5. Step 5: Solve for x
    x = 676,975.31/720.88
  6. Step 6: Final answer
    x = 939.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.