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Finding the Fourth Proportional to 489.36, 674.84 and 419.66

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Solution

The fourth proportional to 489.36, 674.84 and 419.66 is: 578.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.36 : 674.84 = 419.66 : x
  2. Step 2: Convert to fraction form
    489.36/674.84 = 419.66/x
  3. Step 3: Cross multiply
    489.36x = 674.84 × 419.66
  4. Step 4: Simplify right side
    489.36x = 283,203.35
  5. Step 5: Solve for x
    x = 283,203.35/489.36
  6. Step 6: Final answer
    x = 578.72

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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.