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Finding the Fourth Proportional to 515.32, 772.36 and 309.76

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Solution

The fourth proportional to 515.32, 772.36 and 309.76 is: 464.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.32 : 772.36 = 309.76 : x
  2. Step 2: Convert to fraction form
    515.32/772.36 = 309.76/x
  3. Step 3: Cross multiply
    515.32x = 772.36 × 309.76
  4. Step 4: Simplify right side
    515.32x = 239,246.23
  5. Step 5: Solve for x
    x = 239,246.23/515.32
  6. Step 6: Final answer
    x = 464.27

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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.