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Finding the Fourth Proportional to 572.25, 857.40 and 386.75

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Solution

The fourth proportional to 572.25, 857.40 and 386.75 is: 579.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.25 : 857.40 = 386.75 : x
  2. Step 2: Convert to fraction form
    572.25/857.40 = 386.75/x
  3. Step 3: Cross multiply
    572.25x = 857.40 × 386.75
  4. Step 4: Simplify right side
    572.25x = 331,600.14
  5. Step 5: Solve for x
    x = 331,600.14/572.25
  6. Step 6: Final answer
    x = 579.46

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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.