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Finding the Fourth Proportional to 515.77, 711.99 and 319.55

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Solution

The fourth proportional to 515.77, 711.99 and 319.55 is: 441.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.77 : 711.99 = 319.55 : x
  2. Step 2: Convert to fraction form
    515.77/711.99 = 319.55/x
  3. Step 3: Cross multiply
    515.77x = 711.99 × 319.55
  4. Step 4: Simplify right side
    515.77x = 227,512.84
  5. Step 5: Solve for x
    x = 227,512.84/515.77
  6. Step 6: Final answer
    x = 441.12

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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.