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Finding the Fourth Proportional to 515.33, 772.29 and 206.99

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Solution

The fourth proportional to 515.33, 772.29 and 206.99 is: 310.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.33 : 772.29 = 206.99 : x
  2. Step 2: Convert to fraction form
    515.33/772.29 = 206.99/x
  3. Step 3: Cross multiply
    515.33x = 772.29 × 206.99
  4. Step 4: Simplify right side
    515.33x = 159,852.45
  5. Step 5: Solve for x
    x = 159,852.45/515.33
  6. Step 6: Final answer
    x = 310.20

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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.