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Finding the Fourth Proportional to 515.29, 711.21 and 302.74

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Solution

The fourth proportional to 515.29, 711.21 and 302.74 is: 417.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.29 : 711.21 = 302.74 : x
  2. Step 2: Convert to fraction form
    515.29/711.21 = 302.74/x
  3. Step 3: Cross multiply
    515.29x = 711.21 × 302.74
  4. Step 4: Simplify right side
    515.29x = 215,311.72
  5. Step 5: Solve for x
    x = 215,311.72/515.29
  6. Step 6: Final answer
    x = 417.85

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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.