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Finding the Fourth Proportional to 489.38, 673.18 and 469.40

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Solution

The fourth proportional to 489.38, 673.18 and 469.40 is: 645.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.38 : 673.18 = 469.40 : x
  2. Step 2: Convert to fraction form
    489.38/673.18 = 469.40/x
  3. Step 3: Cross multiply
    489.38x = 673.18 × 469.40
  4. Step 4: Simplify right side
    489.38x = 315,986.15
  5. Step 5: Solve for x
    x = 315,986.15/489.38
  6. Step 6: Final answer
    x = 645.69

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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.