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Finding the Fourth Proportional to 577.76, 865.86 and 212.20

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Solution

The fourth proportional to 577.76, 865.86 and 212.20 is: 318.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.76 : 865.86 = 212.20 : x
  2. Step 2: Convert to fraction form
    577.76/865.86 = 212.20/x
  3. Step 3: Cross multiply
    577.76x = 865.86 × 212.20
  4. Step 4: Simplify right side
    577.76x = 183,735.49
  5. Step 5: Solve for x
    x = 183,735.49/577.76
  6. Step 6: Final answer
    x = 318.01

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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.