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Finding the Fourth Proportional to 572.68, 789.76 and 386.20

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Solution

The fourth proportional to 572.68, 789.76 and 386.20 is: 532.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.68 : 789.76 = 386.20 : x
  2. Step 2: Convert to fraction form
    572.68/789.76 = 386.20/x
  3. Step 3: Cross multiply
    572.68x = 789.76 × 386.20
  4. Step 4: Simplify right side
    572.68x = 305,005.31
  5. Step 5: Solve for x
    x = 305,005.31/572.68
  6. Step 6: Final answer
    x = 532.59

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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.