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Finding the Fourth Proportional to 1,091.71, 1,506.68 and 649.65

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Solution

The fourth proportional to 1,091.71, 1,506.68 and 649.65 is: 896.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.71 : 1,506.68 = 649.65 : x
  2. Step 2: Convert to fraction form
    1,091.71/1,506.68 = 649.65/x
  3. Step 3: Cross multiply
    1,091.71x = 1,506.68 × 649.65
  4. Step 4: Simplify right side
    1,091.71x = 978,814.66
  5. Step 5: Solve for x
    x = 978,814.66/1,091.71
  6. Step 6: Final answer
    x = 896.59

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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.