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Finding the Fourth Proportional to 1,075.28, 1,612.94 and 305.80

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Solution

The fourth proportional to 1,075.28, 1,612.94 and 305.80 is: 458.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.28 : 1,612.94 = 305.80 : x
  2. Step 2: Convert to fraction form
    1,075.28/1,612.94 = 305.80/x
  3. Step 3: Cross multiply
    1,075.28x = 1,612.94 × 305.80
  4. Step 4: Simplify right side
    1,075.28x = 493,237.05
  5. Step 5: Solve for x
    x = 493,237.05/1,075.28
  6. Step 6: Final answer
    x = 458.71

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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.