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Finding the Fourth Proportional to 1,217.21, 1,679.45 and 719.64

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Solution

The fourth proportional to 1,217.21, 1,679.45 and 719.64 is: 992.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.21 : 1,679.45 = 719.64 : x
  2. Step 2: Convert to fraction form
    1,217.21/1,679.45 = 719.64/x
  3. Step 3: Cross multiply
    1,217.21x = 1,679.45 × 719.64
  4. Step 4: Simplify right side
    1,217.21x = 1,208,595.80
  5. Step 5: Solve for x
    x = 1,208,595.80/1,217.21
  6. Step 6: Final answer
    x = 992.93

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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.