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Finding the Fourth Proportional to 1,075, 1,612.78 and 458.38

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Solution

The fourth proportional to 1,075, 1,612.78 and 458.38 is: 687.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075 : 1,612.78 = 458.38 : x
  2. Step 2: Convert to fraction form
    1,075/1,612.78 = 458.38/x
  3. Step 3: Cross multiply
    1,075x = 1,612.78 × 458.38
  4. Step 4: Simplify right side
    1,075x = 739,266.10
  5. Step 5: Solve for x
    x = 739,266.10/1,075
  6. Step 6: Final answer
    x = 687.69

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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.