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Finding the Fourth Proportional to 475.53, 712.86 and 280.05

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Solution

The fourth proportional to 475.53, 712.86 and 280.05 is: 419.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.53 : 712.86 = 280.05 : x
  2. Step 2: Convert to fraction form
    475.53/712.86 = 280.05/x
  3. Step 3: Cross multiply
    475.53x = 712.86 × 280.05
  4. Step 4: Simplify right side
    475.53x = 199,636.44
  5. Step 5: Solve for x
    x = 199,636.44/475.53
  6. Step 6: Final answer
    x = 419.82

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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.