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Finding the Fourth Proportional to 577.15, 864.20 and 394.90

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Solution

The fourth proportional to 577.15, 864.20 and 394.90 is: 591.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.15 : 864.20 = 394.90 : x
  2. Step 2: Convert to fraction form
    577.15/864.20 = 394.90/x
  3. Step 3: Cross multiply
    577.15x = 864.20 × 394.90
  4. Step 4: Simplify right side
    577.15x = 341,271.41
  5. Step 5: Solve for x
    x = 341,271.41/577.15
  6. Step 6: Final answer
    x = 591.31

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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.