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Finding the Fourth Proportional to 386.79, 579.51 and 322.21

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Solution

The fourth proportional to 386.79, 579.51 and 322.21 is: 482.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.79 : 579.51 = 322.21 : x
  2. Step 2: Convert to fraction form
    386.79/579.51 = 322.21/x
  3. Step 3: Cross multiply
    386.79x = 579.51 × 322.21
  4. Step 4: Simplify right side
    386.79x = 186,722.47
  5. Step 5: Solve for x
    x = 186,722.47/386.79
  6. Step 6: Final answer
    x = 482.75

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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.