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Finding the Fourth Proportional to 515.76, 711.78 and 294.74

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Solution

The fourth proportional to 515.76, 711.78 and 294.74 is: 406.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.76 : 711.78 = 294.74 : x
  2. Step 2: Convert to fraction form
    515.76/711.78 = 294.74/x
  3. Step 3: Cross multiply
    515.76x = 711.78 × 294.74
  4. Step 4: Simplify right side
    515.76x = 209,786.48
  5. Step 5: Solve for x
    x = 209,786.48/515.76
  6. Step 6: Final answer
    x = 406.75

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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.