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Finding the Fourth Proportional to 513.02, 707.97 and 280.15

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Solution

The fourth proportional to 513.02, 707.97 and 280.15 is: 386.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.02 : 707.97 = 280.15 : x
  2. Step 2: Convert to fraction form
    513.02/707.97 = 280.15/x
  3. Step 3: Cross multiply
    513.02x = 707.97 × 280.15
  4. Step 4: Simplify right side
    513.02x = 198,337.80
  5. Step 5: Solve for x
    x = 198,337.80/513.02
  6. Step 6: Final answer
    x = 386.61

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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.