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Finding the Fourth Proportional to 1,382.61, 1,907.85 and 823.01

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Solution

The fourth proportional to 1,382.61, 1,907.85 and 823.01 is: 1,135.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.61 : 1,907.85 = 823.01 : x
  2. Step 2: Convert to fraction form
    1,382.61/1,907.85 = 823.01/x
  3. Step 3: Cross multiply
    1,382.61x = 1,907.85 × 823.01
  4. Step 4: Simplify right side
    1,382.61x = 1,570,170.09
  5. Step 5: Solve for x
    x = 1,570,170.09/1,382.61
  6. Step 6: Final answer
    x = 1,135.66

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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.