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Finding the Fourth Proportional to 1,281.24, 1,918.71 and 817.65

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Solution

The fourth proportional to 1,281.24, 1,918.71 and 817.65 is: 1,224.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.24 : 1,918.71 = 817.65 : x
  2. Step 2: Convert to fraction form
    1,281.24/1,918.71 = 817.65/x
  3. Step 3: Cross multiply
    1,281.24x = 1,918.71 × 817.65
  4. Step 4: Simplify right side
    1,281.24x = 1,568,833.23
  5. Step 5: Solve for x
    x = 1,568,833.23/1,281.24
  6. Step 6: Final answer
    x = 1,224.46

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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.