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Finding the Fourth Proportional to 515.06, 772.08 and 206.72

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Solution

The fourth proportional to 515.06, 772.08 and 206.72 is: 309.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.06 : 772.08 = 206.72 : x
  2. Step 2: Convert to fraction form
    515.06/772.08 = 206.72/x
  3. Step 3: Cross multiply
    515.06x = 772.08 × 206.72
  4. Step 4: Simplify right side
    515.06x = 159,603.80
  5. Step 5: Solve for x
    x = 159,603.80/515.06
  6. Step 6: Final answer
    x = 309.87

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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.