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Finding the Fourth Proportional to 637.87, 880.08 and 389.20

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Solution

The fourth proportional to 637.87, 880.08 and 389.20 is: 536.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.87 : 880.08 = 389.20 : x
  2. Step 2: Convert to fraction form
    637.87/880.08 = 389.20/x
  3. Step 3: Cross multiply
    637.87x = 880.08 × 389.20
  4. Step 4: Simplify right side
    637.87x = 342,527.14
  5. Step 5: Solve for x
    x = 342,527.14/637.87
  6. Step 6: Final answer
    x = 536.99

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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.