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Finding the Fourth Proportional to 495.47, 683.40 and 318.49

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Solution

The fourth proportional to 495.47, 683.40 and 318.49 is: 439.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.47 : 683.40 = 318.49 : x
  2. Step 2: Convert to fraction form
    495.47/683.40 = 318.49/x
  3. Step 3: Cross multiply
    495.47x = 683.40 × 318.49
  4. Step 4: Simplify right side
    495.47x = 217,656.07
  5. Step 5: Solve for x
    x = 217,656.07/495.47
  6. Step 6: Final answer
    x = 439.29

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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.