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Finding the Fourth Proportional to 513.77, 708.74 and 389.21

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Solution

The fourth proportional to 513.77, 708.74 and 389.21 is: 536.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.77 : 708.74 = 389.21 : x
  2. Step 2: Convert to fraction form
    513.77/708.74 = 389.21/x
  3. Step 3: Cross multiply
    513.77x = 708.74 × 389.21
  4. Step 4: Simplify right side
    513.77x = 275,848.70
  5. Step 5: Solve for x
    x = 275,848.70/513.77
  6. Step 6: Final answer
    x = 536.91

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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.