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Finding the Fourth Proportional to 947.71, 1,421.84 and 687.97

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Solution

The fourth proportional to 947.71, 1,421.84 and 687.97 is: 1,032.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.71 : 1,421.84 = 687.97 : x
  2. Step 2: Convert to fraction form
    947.71/1,421.84 = 687.97/x
  3. Step 3: Cross multiply
    947.71x = 1,421.84 × 687.97
  4. Step 4: Simplify right side
    947.71x = 978,183.26
  5. Step 5: Solve for x
    x = 978,183.26/947.71
  6. Step 6: Final answer
    x = 1,032.15

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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.