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Finding the Fourth Proportional to 525.68, 726.20 and 489.20

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Solution

The fourth proportional to 525.68, 726.20 and 489.20 is: 675.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.68 : 726.20 = 489.20 : x
  2. Step 2: Convert to fraction form
    525.68/726.20 = 489.20/x
  3. Step 3: Cross multiply
    525.68x = 726.20 × 489.20
  4. Step 4: Simplify right side
    525.68x = 355,257.04
  5. Step 5: Solve for x
    x = 355,257.04/525.68
  6. Step 6: Final answer
    x = 675.80

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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.