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Finding the Fourth Proportional to 500.18, 689.58 and 394.88

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Solution

The fourth proportional to 500.18, 689.58 and 394.88 is: 544.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.18 : 689.58 = 394.88 : x
  2. Step 2: Convert to fraction form
    500.18/689.58 = 394.88/x
  3. Step 3: Cross multiply
    500.18x = 689.58 × 394.88
  4. Step 4: Simplify right side
    500.18x = 272,297.90
  5. Step 5: Solve for x
    x = 272,297.90/500.18
  6. Step 6: Final answer
    x = 544.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.