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Finding the Fourth Proportional to 1,075.29, 1,612.85 and 761.65

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Solution

The fourth proportional to 1,075.29, 1,612.85 and 761.65 is: 1,142.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.29 : 1,612.85 = 761.65 : x
  2. Step 2: Convert to fraction form
    1,075.29/1,612.85 = 761.65/x
  3. Step 3: Cross multiply
    1,075.29x = 1,612.85 × 761.65
  4. Step 4: Simplify right side
    1,075.29x = 1,228,419.14
  5. Step 5: Solve for x
    x = 1,228,419.14/1,075.29
  6. Step 6: Final answer
    x = 1,142.41

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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.