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Finding the Fourth Proportional to 577.20, 865.20 and 287.76

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Solution

The fourth proportional to 577.20, 865.20 and 287.76 is: 431.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.20 : 865.20 = 287.76 : x
  2. Step 2: Convert to fraction form
    577.20/865.20 = 287.76/x
  3. Step 3: Cross multiply
    577.20x = 865.20 × 287.76
  4. Step 4: Simplify right side
    577.20x = 248,969.95
  5. Step 5: Solve for x
    x = 248,969.95/577.20
  6. Step 6: Final answer
    x = 431.34

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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.