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Finding the Fourth Proportional to 1,217.25, 1,679.54 and 719.91

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Solution

The fourth proportional to 1,217.25, 1,679.54 and 719.91 is: 993.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.25 : 1,679.54 = 719.91 : x
  2. Step 2: Convert to fraction form
    1,217.25/1,679.54 = 719.91/x
  3. Step 3: Cross multiply
    1,217.25x = 1,679.54 × 719.91
  4. Step 4: Simplify right side
    1,217.25x = 1,209,114.04
  5. Step 5: Solve for x
    x = 1,209,114.04/1,217.25
  6. Step 6: Final answer
    x = 993.32

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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.