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Finding the Fourth Proportional to 525.45, 724.03 and 489

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Solution

The fourth proportional to 525.45, 724.03 and 489 is: 673.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.45 : 724.03 = 489 : x
  2. Step 2: Convert to fraction form
    525.45/724.03 = 489/x
  3. Step 3: Cross multiply
    525.45x = 724.03 × 489
  4. Step 4: Simplify right side
    525.45x = 354,050.67
  5. Step 5: Solve for x
    x = 354,050.67/525.45
  6. Step 6: Final answer
    x = 673.80

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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.