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Finding the Fourth Proportional to 1,075.26, 1,611.96 and 425.64

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Solution

The fourth proportional to 1,075.26, 1,611.96 and 425.64 is: 638.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.26 : 1,611.96 = 425.64 : x
  2. Step 2: Convert to fraction form
    1,075.26/1,611.96 = 425.64/x
  3. Step 3: Cross multiply
    1,075.26x = 1,611.96 × 425.64
  4. Step 4: Simplify right side
    1,075.26x = 686,114.65
  5. Step 5: Solve for x
    x = 686,114.65/1,075.26
  6. Step 6: Final answer
    x = 638.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.