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Finding the Fourth Proportional to 525.66, 726.21 and 489.21

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Solution

The fourth proportional to 525.66, 726.21 and 489.21 is: 675.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.66 : 726.21 = 489.21 : x
  2. Step 2: Convert to fraction form
    525.66/726.21 = 489.21/x
  3. Step 3: Cross multiply
    525.66x = 726.21 × 489.21
  4. Step 4: Simplify right side
    525.66x = 355,269.19
  5. Step 5: Solve for x
    x = 355,269.19/525.66
  6. Step 6: Final answer
    x = 675.85

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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.