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Finding the Fourth Proportional to 463.68, 639.72 and 289.20

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Solution

The fourth proportional to 463.68, 639.72 and 289.20 is: 399.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.68 : 639.72 = 289.20 : x
  2. Step 2: Convert to fraction form
    463.68/639.72 = 289.20/x
  3. Step 3: Cross multiply
    463.68x = 639.72 × 289.20
  4. Step 4: Simplify right side
    463.68x = 185,007.02
  5. Step 5: Solve for x
    x = 185,007.02/463.68
  6. Step 6: Final answer
    x = 399.00

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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.