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Finding the Fourth Proportional to 577.90, 866.85 and 487.90

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Solution

The fourth proportional to 577.90, 866.85 and 487.90 is: 731.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.90 : 866.85 = 487.90 : x
  2. Step 2: Convert to fraction form
    577.90/866.85 = 487.90/x
  3. Step 3: Cross multiply
    577.90x = 866.85 × 487.90
  4. Step 4: Simplify right side
    577.90x = 422,936.12
  5. Step 5: Solve for x
    x = 422,936.12/577.90
  6. Step 6: Final answer
    x = 731.85

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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.