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Finding the Fourth Proportional to 515.71, 711.78 and 316.45

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Solution

The fourth proportional to 515.71, 711.78 and 316.45 is: 436.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.71 : 711.78 = 316.45 : x
  2. Step 2: Convert to fraction form
    515.71/711.78 = 316.45/x
  3. Step 3: Cross multiply
    515.71x = 711.78 × 316.45
  4. Step 4: Simplify right side
    515.71x = 225,239.22
  5. Step 5: Solve for x
    x = 225,239.22/515.71
  6. Step 6: Final answer
    x = 436.76

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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.