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Finding the Fourth Proportional to 489.47, 679.14 and 485.29

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Solution

The fourth proportional to 489.47, 679.14 and 485.29 is: 673.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.47 : 679.14 = 485.29 : x
  2. Step 2: Convert to fraction form
    489.47/679.14 = 485.29/x
  3. Step 3: Cross multiply
    489.47x = 679.14 × 485.29
  4. Step 4: Simplify right side
    489.47x = 329,574.03
  5. Step 5: Solve for x
    x = 329,574.03/489.47
  6. Step 6: Final answer
    x = 673.33

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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.