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Finding the Fourth Proportional to 515.71, 711.74 and 294.74

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Solution

The fourth proportional to 515.71, 711.74 and 294.74 is: 406.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.71 : 711.74 = 294.74 : x
  2. Step 2: Convert to fraction form
    515.71/711.74 = 294.74/x
  3. Step 3: Cross multiply
    515.71x = 711.74 × 294.74
  4. Step 4: Simplify right side
    515.71x = 209,778.25
  5. Step 5: Solve for x
    x = 209,778.25/515.71
  6. Step 6: Final answer
    x = 406.78

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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.