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Finding the Fourth Proportional to 495.55, 684.17 and 318.59

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Solution

The fourth proportional to 495.55, 684.17 and 318.59 is: 439.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.55 : 684.17 = 318.59 : x
  2. Step 2: Convert to fraction form
    495.55/684.17 = 318.59/x
  3. Step 3: Cross multiply
    495.55x = 684.17 × 318.59
  4. Step 4: Simplify right side
    495.55x = 217,971.29
  5. Step 5: Solve for x
    x = 217,971.29/495.55
  6. Step 6: Final answer
    x = 439.86

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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.