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Finding the Fourth Proportional to 483.49, 721.18 and 439.75

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Solution

The fourth proportional to 483.49, 721.18 and 439.75 is: 655.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.49 : 721.18 = 439.75 : x
  2. Step 2: Convert to fraction form
    483.49/721.18 = 439.75/x
  3. Step 3: Cross multiply
    483.49x = 721.18 × 439.75
  4. Step 4: Simplify right side
    483.49x = 317,136.71
  5. Step 5: Solve for x
    x = 317,136.71/483.49
  6. Step 6: Final answer
    x = 655.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.