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Finding the Fourth Proportional to 639.51, 953.58 and 638.34

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Solution

The fourth proportional to 639.51, 953.58 and 638.34 is: 951.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.51 : 953.58 = 638.34 : x
  2. Step 2: Convert to fraction form
    639.51/953.58 = 638.34/x
  3. Step 3: Cross multiply
    639.51x = 953.58 × 638.34
  4. Step 4: Simplify right side
    639.51x = 608,708.26
  5. Step 5: Solve for x
    x = 608,708.26/639.51
  6. Step 6: Final answer
    x = 951.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.