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Finding the Fourth Proportional to 515.69, 711.65 and 319.31

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Solution

The fourth proportional to 515.69, 711.65 and 319.31 is: 440.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.69 : 711.65 = 319.31 : x
  2. Step 2: Convert to fraction form
    515.69/711.65 = 319.31/x
  3. Step 3: Cross multiply
    515.69x = 711.65 × 319.31
  4. Step 4: Simplify right side
    515.69x = 227,236.96
  5. Step 5: Solve for x
    x = 227,236.96/515.69
  6. Step 6: Final answer
    x = 440.65

Related Problems

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Double scale
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Similar ratio
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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.