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Finding the Fourth Proportional to 637.63, 879.91 and 389.10

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Solution

The fourth proportional to 637.63, 879.91 and 389.10 is: 536.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.63 : 879.91 = 389.10 : x
  2. Step 2: Convert to fraction form
    637.63/879.91 = 389.10/x
  3. Step 3: Cross multiply
    637.63x = 879.91 × 389.10
  4. Step 4: Simplify right side
    637.63x = 342,372.98
  5. Step 5: Solve for x
    x = 342,372.98/637.63
  6. Step 6: Final answer
    x = 536.95

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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.