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Finding the Fourth Proportional to 1,382.72, 2,075.72 and 561.65

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Solution

The fourth proportional to 1,382.72, 2,075.72 and 561.65 is: 843.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.72 : 2,075.72 = 561.65 : x
  2. Step 2: Convert to fraction form
    1,382.72/2,075.72 = 561.65/x
  3. Step 3: Cross multiply
    1,382.72x = 2,075.72 × 561.65
  4. Step 4: Simplify right side
    1,382.72x = 1,165,814.95
  5. Step 5: Solve for x
    x = 1,165,814.95/1,382.72
  6. Step 6: Final answer
    x = 843.13

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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.