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Finding the Fourth Proportional to 515.82, 772.35 and 309.42

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Solution

The fourth proportional to 515.82, 772.35 and 309.42 is: 463.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.82 : 772.35 = 309.42 : x
  2. Step 2: Convert to fraction form
    515.82/772.35 = 309.42/x
  3. Step 3: Cross multiply
    515.82x = 772.35 × 309.42
  4. Step 4: Simplify right side
    515.82x = 238,980.54
  5. Step 5: Solve for x
    x = 238,980.54/515.82
  6. Step 6: Final answer
    x = 463.30

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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.