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Finding the Fourth Proportional to 1,287.65, 1,927.35 and 1,090.82

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Solution

The fourth proportional to 1,287.65, 1,927.35 and 1,090.82 is: 1,632.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.65 : 1,927.35 = 1,090.82 : x
  2. Step 2: Convert to fraction form
    1,287.65/1,927.35 = 1,090.82/x
  3. Step 3: Cross multiply
    1,287.65x = 1,927.35 × 1,090.82
  4. Step 4: Simplify right side
    1,287.65x = 2,102,382.29
  5. Step 5: Solve for x
    x = 2,102,382.29/1,287.65
  6. Step 6: Final answer
    x = 1,632.73

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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.