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Finding the Fourth Proportional to 1,075.72, 1,613.48 and 426.28

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Solution

The fourth proportional to 1,075.72, 1,613.48 and 426.28 is: 639.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.72 : 1,613.48 = 426.28 : x
  2. Step 2: Convert to fraction form
    1,075.72/1,613.48 = 426.28/x
  3. Step 3: Cross multiply
    1,075.72x = 1,613.48 × 426.28
  4. Step 4: Simplify right side
    1,075.72x = 687,794.25
  5. Step 5: Solve for x
    x = 687,794.25/1,075.72
  6. Step 6: Final answer
    x = 639.38

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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.