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Finding the Fourth Proportional to 489.84, 674.79 and 466.40

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Solution

The fourth proportional to 489.84, 674.79 and 466.40 is: 642.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.84 : 674.79 = 466.40 : x
  2. Step 2: Convert to fraction form
    489.84/674.79 = 466.40/x
  3. Step 3: Cross multiply
    489.84x = 674.79 × 466.40
  4. Step 4: Simplify right side
    489.84x = 314,722.06
  5. Step 5: Solve for x
    x = 314,722.06/489.84
  6. Step 6: Final answer
    x = 642.50

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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.