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Finding the Fourth Proportional to 580.48, 872 and 489.36

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Solution

The fourth proportional to 580.48, 872 and 489.36 is: 735.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    580.48 : 872 = 489.36 : x
  2. Step 2: Convert to fraction form
    580.48/872 = 489.36/x
  3. Step 3: Cross multiply
    580.48x = 872 × 489.36
  4. Step 4: Simplify right side
    580.48x = 426,721.92
  5. Step 5: Solve for x
    x = 426,721.92/580.48
  6. Step 6: Final answer
    x = 735.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.