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Finding the Fourth Proportional to 639.64, 883.02 and 433.72

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Solution

The fourth proportional to 639.64, 883.02 and 433.72 is: 598.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.64 : 883.02 = 433.72 : x
  2. Step 2: Convert to fraction form
    639.64/883.02 = 433.72/x
  3. Step 3: Cross multiply
    639.64x = 883.02 × 433.72
  4. Step 4: Simplify right side
    639.64x = 382,983.43
  5. Step 5: Solve for x
    x = 382,983.43/639.64
  6. Step 6: Final answer
    x = 598.75

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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.