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Finding the Fourth Proportional to 1,217.22, 1,679.43 and 719.64

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Solution

The fourth proportional to 1,217.22, 1,679.43 and 719.64 is: 992.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.22 : 1,679.43 = 719.64 : x
  2. Step 2: Convert to fraction form
    1,217.22/1,679.43 = 719.64/x
  3. Step 3: Cross multiply
    1,217.22x = 1,679.43 × 719.64
  4. Step 4: Simplify right side
    1,217.22x = 1,208,585.01
  5. Step 5: Solve for x
    x = 1,208,585.01/1,217.22
  6. Step 6: Final answer
    x = 992.91

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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.