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Finding the Fourth Proportional to 639.36, 956.40 and 484.12

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Solution

The fourth proportional to 639.36, 956.40 and 484.12 is: 724.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.36 : 956.40 = 484.12 : x
  2. Step 2: Convert to fraction form
    639.36/956.40 = 484.12/x
  3. Step 3: Cross multiply
    639.36x = 956.40 × 484.12
  4. Step 4: Simplify right side
    639.36x = 463,012.37
  5. Step 5: Solve for x
    x = 463,012.37/639.36
  6. Step 6: Final answer
    x = 724.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.