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Finding the Fourth Proportional to 489, 674.62 and 320.89

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Solution

The fourth proportional to 489, 674.62 and 320.89 is: 442.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 674.62 = 320.89 : x
  2. Step 2: Convert to fraction form
    489/674.62 = 320.89/x
  3. Step 3: Cross multiply
    489x = 674.62 × 320.89
  4. Step 4: Simplify right side
    489x = 216,478.81
  5. Step 5: Solve for x
    x = 216,478.81/489
  6. Step 6: Final answer
    x = 442.70

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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.