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Finding the Fourth Proportional to 515.21, 710.99 and 282.34

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Solution

The fourth proportional to 515.21, 710.99 and 282.34 is: 389.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.21 : 710.99 = 282.34 : x
  2. Step 2: Convert to fraction form
    515.21/710.99 = 282.34/x
  3. Step 3: Cross multiply
    515.21x = 710.99 × 282.34
  4. Step 4: Simplify right side
    515.21x = 200,740.92
  5. Step 5: Solve for x
    x = 200,740.92/515.21
  6. Step 6: Final answer
    x = 389.63

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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.