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Finding the Fourth Proportional to 495.52, 688.12 and 490.72

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Solution

The fourth proportional to 495.52, 688.12 and 490.72 is: 681.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.52 : 688.12 = 490.72 : x
  2. Step 2: Convert to fraction form
    495.52/688.12 = 490.72/x
  3. Step 3: Cross multiply
    495.52x = 688.12 × 490.72
  4. Step 4: Simplify right side
    495.52x = 337,674.25
  5. Step 5: Solve for x
    x = 337,674.25/495.52
  6. Step 6: Final answer
    x = 681.45

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.