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Finding the Fourth Proportional to 639.44, 885.84 and 624.32

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Solution

The fourth proportional to 639.44, 885.84 and 624.32 is: 864.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.44 : 885.84 = 624.32 : x
  2. Step 2: Convert to fraction form
    639.44/885.84 = 624.32/x
  3. Step 3: Cross multiply
    639.44x = 885.84 × 624.32
  4. Step 4: Simplify right side
    639.44x = 553,047.63
  5. Step 5: Solve for x
    x = 553,047.63/639.44
  6. Step 6: Final answer
    x = 864.89

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.