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Finding the Fourth Proportional to 491.02, 672.92 and 490.20

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Solution

The fourth proportional to 491.02, 672.92 and 490.20 is: 671.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.02 : 672.92 = 490.20 : x
  2. Step 2: Convert to fraction form
    491.02/672.92 = 490.20/x
  3. Step 3: Cross multiply
    491.02x = 672.92 × 490.20
  4. Step 4: Simplify right side
    491.02x = 329,865.38
  5. Step 5: Solve for x
    x = 329,865.38/491.02
  6. Step 6: Final answer
    x = 671.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.