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Finding the Fourth Proportional to 495.66, 684.74 and 391.44

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Solution

The fourth proportional to 495.66, 684.74 and 391.44 is: 540.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.66 : 684.74 = 391.44 : x
  2. Step 2: Convert to fraction form
    495.66/684.74 = 391.44/x
  3. Step 3: Cross multiply
    495.66x = 684.74 × 391.44
  4. Step 4: Simplify right side
    495.66x = 268,034.63
  5. Step 5: Solve for x
    x = 268,034.63/495.66
  6. Step 6: Final answer
    x = 540.76

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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.