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Finding the Fourth Proportional to 515.67, 711.39 and 316.32

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Solution

The fourth proportional to 515.67, 711.39 and 316.32 is: 436.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.67 : 711.39 = 316.32 : x
  2. Step 2: Convert to fraction form
    515.67/711.39 = 316.32/x
  3. Step 3: Cross multiply
    515.67x = 711.39 × 316.32
  4. Step 4: Simplify right side
    515.67x = 225,026.88
  5. Step 5: Solve for x
    x = 225,026.88/515.67
  6. Step 6: Final answer
    x = 436.38

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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.