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Finding the Fourth Proportional to 463.60, 639.72 and 389.72

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Solution

The fourth proportional to 463.60, 639.72 and 389.72 is: 537.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.60 : 639.72 = 389.72 : x
  2. Step 2: Convert to fraction form
    463.60/639.72 = 389.72/x
  3. Step 3: Cross multiply
    463.60x = 639.72 × 389.72
  4. Step 4: Simplify right side
    463.60x = 249,311.68
  5. Step 5: Solve for x
    x = 249,311.68/463.60
  6. Step 6: Final answer
    x = 537.77

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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.