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Finding the Fourth Proportional to 1,382.19, 1,907.30 and 761.19

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Solution

The fourth proportional to 1,382.19, 1,907.30 and 761.19 is: 1,050.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.19 : 1,907.30 = 761.19 : x
  2. Step 2: Convert to fraction form
    1,382.19/1,907.30 = 761.19/x
  3. Step 3: Cross multiply
    1,382.19x = 1,907.30 × 761.19
  4. Step 4: Simplify right side
    1,382.19x = 1,451,810.05
  5. Step 5: Solve for x
    x = 1,451,810.05/1,382.19
  6. Step 6: Final answer
    x = 1,050.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.