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Finding the Fourth Proportional to 524.39, 786.60 and 280.80

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Solution

The fourth proportional to 524.39, 786.60 and 280.80 is: 421.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    524.39 : 786.60 = 280.80 : x
  2. Step 2: Convert to fraction form
    524.39/786.60 = 280.80/x
  3. Step 3: Cross multiply
    524.39x = 786.60 × 280.80
  4. Step 4: Simplify right side
    524.39x = 220,877.28
  5. Step 5: Solve for x
    x = 220,877.28/524.39
  6. Step 6: Final answer
    x = 421.21

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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.